MEXICO CITY — The slaughter last month of at least 15 young people with no apparent criminal ties has galvanized the Mexican public in ways not seen here in more than three years of bloody drug warfare and has forced the government to enact long-resisted policy changes to combat violence.

Some in Mexico are wondering if this is their nation’s tipping point, a moment when public outrage that has bubbled along finally overcame the fear and fatalism that until now largely silenced or intimidated Mexican society.

Led by parents of the victims in the Jan. 31 massacre, citizens of Ciudad Juarez have marched, protested, challenged Mexican President Felipe Calderon and demanded a new strategy for reducing the gruesome crimes that have made their city one of the world’s deadliest. Joining grieving parents in their wrath have been civic leaders, entrepreneurs, politicians, educators and priests.

“”For the very, very first time, people, civil society as a whole, have come together and decided, this is enough,”” said Marcos Fastlicht, a prominent Mexico City businessman who heads an organization dedicated to the uphill task of promoting citizen participation in crime-fighting. “”And they’ve said that to Calderon … to his ministers … that they are not going to take any more”” neglect and broken promises.

Calderon, an often aloof leader seemingly impervious to criticism, has responded by apparently heeding the complaints and making the remarkable concession that his military-led war on drug cartels has proved insufficient.

He traveled to Ciudad Juarez twice in less than a week’s time, amid noisy street demonstrations demanding that he resign and with key Cabinet ministers in tow, and received long litanies of grievances from the beleaguered public. He quietly took a tongue-lashing from a middle-aged maquiladora worker, mother of two teenagers killed in the massacre, who confronted him abruptly at a town meeting.

“”President, I cannot welcome you here,”” Luz Maria Davila started, voice raised; Calderon waved off an aide who moved to whisk Davila away. “”We are living the consequences of a war we did not ask for.””

It was a highly unusual rebuke from a humble woman in a country that retains paternalistic tendencies and demands a certain reverence for presidential figures.

Almost since its inception when Calderon took office in December 2006, the president’s anti-drug policy has been roundly criticized for emphasizing military and police repression and largely ignoring other components of the multibillion-dollar drug-trafficking industry. Poverty and lack of opportunity send thousands into the ranks of cartel foot soldiers in Ciudad Juarez, just across the border from El Paso, Texas. The Mexican city became the extreme, terror-gripped example of the policy’s shortcomings.

Even as 10,000 army troops and federal police were deployed, someone was killed in Ciudad Juarez last year about every three hours on average and up to half a million residents fled, a quarter of the population. As early as last summer, authorities told the Los Angeles Times they were reviewing and planning to make changes in the strategy for combating organized crime in the troubled city — a pledge made throughout the rest of the year, but never put into action.

Calderon now has been forced to offer a mea culpa and act. Embracing the citizens’ slogan, “”We are all Juarez,”” he acknowledged that his strategy had neglected socioeconomic factors and established a $50-million fund for new schools, clinics and job-creation programs, while also promising to assign a large contingent of judicial investigators to Ciudad Juarez.

“”By hearing the demands and the indignation directly,”” political analyst Alfonso Zarate in Mexico City said, Calderon “”has an opportunity to rectify and to act differently.””

Skeptics accuse Calderon of moving now because it’s an election year. Both the governorship of Chihuahua state, where Ciudad Juarez is located, and the mayor’s post in the city are held by Calderon’s chief rival party and are up for grabs in voting scheduled in July.

Whatever his electoral calculations, however, Calderon is also keenly aware of the corrosive political damage of the Ciudad Juarez disaster on his government, an erosion that goes far beyond the screaming crowds in the border city’s streets.

A poll out this week showed a dramatic decline nationwide in support for Calderon’s government. An overwhelming majority said violent crime had increased substantially in the last six months, and solidly half the nation said the president’s war on drug cartels was failing. The poll by Buendia & Laredo sampled 1,000 people in face-to-face interviews and had a margin of error of 3.5 percentage points.

And there has been a busy confluence of voices of criticism from segments of society, such as the Roman Catholic Church, that had remained until now largely on the sidelines.

A member of Calderon’s own National Action Party, legislator Manuel Clouthier Carrillo, accused the government of playing favorites in going after drug gangs, leaving the largest and most powerful of them, the so-called Sinaloa cartel led by fugitive kingpin Joaquin “”El Chapo”” Guzman, untouched. Clouthier was not clear about what Calderon’s alleged motives might be, but the suggestion stung and his colleagues are demanding that he retract it.

So far the citizen outcry in Ciudad Juarez has been channeled toward demands the government change course and withdraw the army (Calderon refused). It has not focused on residents’ own responsibilities in challenging drug gangs.

Many Mexicans have in effect become complicit by failing to speak out. But there were signs of that changing too.

Heriberto Galindo, one of the dozens of community leaders petitioning Calderon in Ciudad Juarez this week, scolded his neighbors for consistently lashing out at the government and army but never the traffickers.

“”We have to assume our own portion of blame as well,”” Galindo said. “”It is not always the government that is responsible for the killing of a child.””

The only other recent incident that provoked a level of outrage similar to that generated by the deaths of the young people in January was the 2008 kidnapping and killing of a boy from a wealthy Mexico City family, a tragedy that unleashed angry marches across the country. But the response quickly lost momentum.

It is possible that once again, the furor — this time over the killing of the youths in Ciudad Juarez — could disappear in the ephemera of rhetoric absent concrete action. Already, several Juarez activists are complaining that the issue of human rights, much violated in recent months, was given short shrift in the talks with Calderon.

“”The first step is to regain the public’s trust,”” said Ciudad Juarez Mayor Jose Reyes Ferriz, “”and that is not done with a government decree.””