The stabbing death of Kevin Sutherland on July 4 on a Metro train while passengers watched has sparked a furious debate: Should his fellow passengers have done anything to stop it? Could they have done anything even if they wanted?

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McLEAN, Va. — Kevin Sutherland died in the first homicide aboard a Metro train in the subway system’s nearly 40-year history, stabbed to death after resisting a robbery attempt. The attack stunned passengers who watched it unfold.

In the days since, it has sparked a furious debate: Should Sutherland’s fellow passengers have done anything to stop it? Could they have done anything even if they wanted?

Two days after the July 4 attack on the Red Line Metro train, police arrested 18-year-old Jasper Spires — described as slight, at 5’ 5” and 125 pounds — and charged him with murder.

Police documents indicate at least four witnesses on the car were interviewed about what they saw, describing a brutal attack. One witness says she saw the attacker try to take something from Sutherland, 24, and that a struggle ensued. The attacker then began punching Sutherland repeatedly while he cried out for help.

While Sutherland lay on the floor bleeding, the attacker threw a cellphone at Sutherland and then began to rob others on the train, according to witnesses, before running away.

The attack has raised the “What would you do?” question for Washingtonians. Online bulletin boards such as Reddit and DCUrbanMom lit up with opinions, and multiple Washington Post columnists have tackled the topic.

The subway is crowded on most weekdays in a metro area legendary for its hellish commute, and crime has shown a steady decline over the past several years. Police are clear in their advice to witnesses: Don’t jump in and try to be a hero. Metro Transit Police issued a statement saying they “do not advise people to intervene or confront suspects, out of concern for their safety.”

Instead, they urge people to call police, be a good witness by taking note of a suspect’s description and distinguishing characteristics, and staying on the scene to answer officers’ questions.

The incident raises comparisons to the infamous 1964 slaying of Kitty Genovese in New York City. Reports at the time indicated that numerous people heard her screams but failed to call police, even though some of the worst descriptions of collective inaction in that case have since been debunked.

Social-science researchers a few years later documented the “Bystander Effect,” in which large groups of people often fail to help a person in an emergency.

Todd Farchione, a clinical psychologist and professor and Boston University’s Center for Anxiety and Related Disorders, said modern research continues to document the phenomenon, and has refined and explored the factors that make witnesses more or less likely to intervene.

Some are fairly obvious, such as the risk of harm that may come by intervening. That obviously is significant in a case where an assailant is armed with a knife and stabbing a person; court documents indicate Sutherland suffered more than 20 stab wounds.

Indeed, police reports state that Spires menaced others in the car after the attack, saying “What do ya’ll got?” and robbed at least two others.

Other factors are more subtle. Farchione said research has shown that people are more likely to intervene if they know a victim is a stranger to their assailant. People are also more likely to intervene if they are familiar with their environment, suggesting that a Metro attack on a rush-hour train with regular commuters may have seen a different outcome than a July 4 train on a holiday schedule populated with tourists unfamiliar with the system.

People are also more likely to step up when they see that somebody else has taken the lead.

“When somebody does step in, others will as well,” Farchione said. “It’s taking that first step. Everyone looks to everyone else.”

At the Tysons Corner Metro station, riders said they generally feel safe. The Metro system, once a jewel of the D.C. region, serves more than 720,000 riders a day, and in recent years has been plagued by operational problems, but generally maintains a good reputation for safety.