I don't think the people speaking in this video are children, at least chronologically. They sound old enough to own the consequences of their actions.
And you're right, obviously, that mandatory suicide is asking too much, but I don't get the impression that they would thoughtfully read and contemplate a few hundred words which explain precisely why what they are doing is wrong, the implied sexism of their video (watch again and count how many times the players are referred to with a human word like "women" or "ladies" and how many times they are referred to with dehumanizing words like "dogs," "bitches," or the like), and how their video contributes nothing and makes the world a worse place-- so short of being able to punch someone through the internet with my cartoon fist emerging from their display to break their noses, a blunt and shocking word of rebuke from me will have to suffice. And that's provided they are even present here to read my words of rebuke in the first place. I confess that part of my rage is the knowledge that these chuckle****s may never be even aware of the damage they are doing to civilization by behaving the way they do, because they are insulated behind the semi-anonymous layer of a YouTube user name and account.
I would like to see how these men behaved if they were stood physically in front of the four players in the video and asked to defend their work. I get the impression that they would be much less brave.