[Pontiac]

He was a druggie homeless man, and that's the kind of people attracted to this mayhem.

I have read another article that said the shooter had been living in the park before the protesters move in.

If he was a bit mentally challenged he probably just decided he would join the crowd and when they repeatedly rejected him and threw him out of what he considered his home he decided to retaliate.

[Steven Tyler]

....when they repeatedly rejected him and threw him out of what he considered his home he decided to retaliate...

That is the Native’s complaint against the “Colonizers”