Thinking more about your post, haven't you misrepresented what a Trump rally is?  I am not comparing a Trump rally to a 50th wedding anniversary where "street youth" "waltz" in and ruin a party by screaming and hollering profanities. Can you tell me how the two compare? Or is that a straw man?
I agree that shouting obscenities and holding placards in protest is inappropriate. Do you believe it justifies a potential president saying "I like to punch him in the face"?  Do you think there is a sense of encouragement to suggest, as Trump did, that he'd pay the legal fees if anyone was arrested reacting violently to a person shouting obscenities and raising a poster in protest?  And do you think the rallies are so susceptible to outside agitators that they simply can't help themselves but to punch someone out? 

It really shows weakness on the part of Trump and his followers. I don't condone any protester engaging in violence. But to stand peacefully as below does not warrant a fist.