DAVID GREENE, HOST:
And we are focused on Dallas this morning. In that city last night, snipers opened fire on police killing five officers and injuring six other officers and also one civilian. The attack happened while protesters were demonstrating police-involved shootings of two African-American men earlier this week. In Baton Rouge, La., Alton Sterling died. In Minnesota Philando Castile died.
Now, of course, before that, Michael Brown in Ferguson, Mo., Laquan McDonald in Chicago, Tamir Rice in Cleveland. It might seem like there are a lot more cases of people being shot and killed by police, but as NPR's Joseph Shapiro reports, it's just that we're paying more attention.
JOSEPH SHAPIRO, BYLINE: The number of police shootings - that stayed pretty much constant from year to year.
PHIL STINSON: Our best estimate is that about a thousand times a year, a police officer somewhere in the United States shoots and kills somebody. And so far this year, we're right on track for that number.
SHAPIRO: Phil Stinson, a criminologist at Bowling Green State University in Ohio, says some people have long paid attention to police shootings.
STINSON: People that live in urban communities have always known that this goes on, and it goes on fairly regularly. The problem is nobody else was paying attention until just the last few years, and I think we reached a tipping point right around the time that Michael Brown was killed in Ferguson, Mo.
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UNIDENTIFIED CROWD: (Chanting) Hands up, don't shoot. Hands up, don't shoot...
STINSON: And since then, everybody's paying attention.
SHAPIRO: Protests and the Black Lives Matter movement made a difference, but Stinson thinks what made us pay attention the most was technology - all those cell phone videos.
STINSON: I don't think anybody would pay attention to all the advocates and all the protests, but for the videos. And, you know, a dead man can't talk. It used to be that the police owned the narrative. And now we've got another side to the story quite often with the videos.
SHAPIRO: Those videos make everyone a witness to a shooting. David Klinger at the University of Missouri-St. Louis says more attention can be a positive thing, but that police shootings are complex events and there's more evidence than just one video.
DAVID KLINGER: And there have been cases where from multiple angles with multiple videos, it might look like a, quote, unquote, "bad shooting" from one angle because you can't see what's in the suspect's hand. But then from another angle, it clearly shows a suspect has a firearm in their hand.
SHAPIRO: Klinger has a personal perspective. Before he was a professor, he was a cop. And one day while on duty about 35 years ago, he shot and killed a man who was attacking his partner with a butcher knife. It's one reason he studies police shootings now. Klinger thinks there's one more reason police shootings get more attention today - the public's sinking faith in government.
KLINGER: Police are the most visible representation of government.
SHAPIRO: Cops are often the first place where we interact with government.
KLINGER: When people are protesting in Chicago, in Minneapolis, it's not just we want these officers held accountable, if we want the chief fired, we want the mayor to resign, we want the governor to resign and so that the protest is not merely about what the police are doing. It's about how everybody up and down that chain of command is doing.
SHAPIRO: Government officials are paying more attention. After a police officer shot and killed Alton Sterling in Baton Rouge on Tuesday, the video got played over and over in the media and on social media. The Justice Department then did something unusual. It moved quickly to take over the case and open its own investigation. Joseph Shapiro, NPR News.
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