Earlier quoted context omitted.
Hard to see a "brutal attack" from the video (although it is unclear). More a fairly typical forced ejection scuffle. I'd like to know more before forming any view. The poster offers email on domains including one named rape.lol so is obviously a charming fellow.
Agreed. Seems like one of those "free speech advocates" that enjoys being as offensive as possible and then howls if anyone tries to take their content down. The video is definitely not a "brutal assault". If the video is bad or incomplete, after pictures of injuries would easily prove his point. Attention-seeking behavior.
In Germany, "free speech" is not so deeply culturally ingrained: in the German Grundgesetz, paragraph 5, there is a concept of "Meinungsfreiheit" (freedom of opinion) (https://www.gesetze-im-internet.de/gg/art_5.html) which, even though "sufficient for most practical purposes", does not go as far as "free speech" in the USA.