Funny you missed the part about this guy throwing things and intimidating people. If this was a left wing nut instigating violence and getting punched out, i am guessing you would certainly be applauding the story.
Your guesses, like most of your opinions and beliefs, are wrong. And I can only go by what I saw in the video, which is some uninvolved guy coming over while the Nazi was talking and punching him in the face.