That would defeat the purpose. The videos need to be seen so that other people (they hope) will say "everyone is upset and angry, I should be too!" Sociologists refer to it as "social proof" and we look to it to help us make up our mind about things. If others are doing something, it must be correct, right? Advertisers use this all the time. Leftists agitators do too.
The video that will really go viral is when some Trump supporter gets spit on or otherwise assoulted and he throws a punch in self defense. The provocation will be edited out and the "evil" MAGA hat wearing guy will be made into public enemy number one. Then all the violent and angry lefty videos will disappear so they can construct a narrative about violent conservatives. But until then the videos stay so they can influence the weak minded.
This, of course, is exactly what they did over and over again at Trump rallies during the campaign, using paid provocateurs, and that is exactly how it was all handled by the media.