The Marshall Project – Disproportionate use of force can turn a peaceful protest violent, research shows. “…Watching a peaceful protest turn into something much less palatable is hard. There has been a lot of hard the past few days, as people in dozens of cities have released pent-up anger against discriminatory police tactics. Cars and buildings have burned. Store windows have been smashed. Protesters and police have been hurt. When protests take a turn like this we naturally wonder … why? Was this preventable? Does anyone know how to stop it from happening? Turns out, we do know some of these answers. Researchers have spent 50 years studying the way crowds of protesters and crowds of police behave—and what happens when the two interact. One thing they will tell you is that when the police respond by escalating force—wearing riot gear from the start, or using tear gas on protesters—it doesn’t work. In fact, disproportionate police force is one of the things that can make a peaceful protest not so peaceful. But if we know that (and have known that for decades), why are police still doing it? “There’s this failed mindset of ‘if we show force, immediately we will deter criminal activity or unruly activity’ and show me where that has worked,” said Scott Thomson, the former chief of police in Camden, New Jersey. “That’s the primal response,” he said. “The adrenaline starts to pump, the temperature in the room is rising, and you want to go one step higher. But what we need to know as professionals is that there are times, if we go one step higher, we are forcing them to go one step higher.”…