The situation seems to be that pro-Sanders protestors and LaRaza protestors we're all protesting Trump. As always happens, the more organized and violent group with their own agenda have taken over the protests. If Sanders anti-Trump protestors back off, those anti-Trump RIOTS are going to be totally in the hands of paid-for gangs of thugs striving to dismantle US sovereignty.
What happens when that group, Black Lives Matter, and Sanders supporters all show up at conventions and other flashpoints to protest, at the same time? At that point, there will be pushback, when folks have to defend themselves. Yikes
The worse of the violence will take place in Philly, but there will be issues of security at Cleveland as well. At the same time, do not be surprised in regards to the later, Gov. Kasich will end up calling up the NG to provide security.