They were either going to or coming from a riot area.
Their responsibility is to make sure the riot doesn't spread and stop the riot. They can't do that effectively if they have to wade through a massive crowd of onlookers appearing wherever they go. Bad actors easily mix in to situations like this and make the situation extremely dangerous for everyone. If someone doesn't respond to direct commands in such an emergency, they're going to be seen as potential bad actors.
It's totally reasonable to demand that people stay inside their houses while the police are securing the area.
If it was reasonable, it would encoded into the law. It is not for the police to create new laws on the spot, and even if it were, the use of force to enforce it is not reasonable.
Proportionate force is justifiable in an emergency, and we'll see if it is really "against the law" for police to demand that people get inside temporarily.
My guess? Absolutely NOTHING will happen to those police that paintballed the porch gawkers after very clearly telling them to go inside.
Having seen what happened in Baltimore in 2015 and now Philly, I am terrified of the idea of a city going up in flames when a riot gets out of control. It's been too close the times that I've seen it personally. Historically, it has been far worse.
Their responsibility is to make sure the riot doesn't spread and stop the riot. They can't do that effectively if they have to wade through a massive crowd of onlookers appearing wherever they go. Bad actors easily mix in to situations like this and make the situation extremely dangerous for everyone. If someone doesn't respond to direct commands in such an emergency, they're going to be seen as potential bad actors.
It's totally reasonable to demand that people stay inside their houses while the police are securing the area.