Could America become lawless like Haiti and being overrun with gangs, except the gangs are government agents attacking civilians?

Anywhere COULD end up like that. Hopefully this is just a blip and we don't. We've been through horrible times before and rose out of them. Not always painlessly and not always perfectly. But we shouldn't let ourselves get dragged into tyranny over a few tyrannical actions. We must continue peaceful civil resistance. They want people to get violent to justify more murders like this. Don't give them the violence.