I know law is different in different situations but arming yourself and intentionally putting yourself in a situation you had no right to be in is a factor.Lol...he was there alright armed with a semi-auto, did he walk the streets firing at people? nope...people challenged him, looked at him like he was a schmuck with a gun and not willing to defend himself when the going gets tough...they were wrong...
I'm also sure that if it were an armed BLM protester interjecting himself in Trump rally, people would be saying the Trumpies had a right to defend themselves from the armed "thug".