Kim this is how he has won Every Single Time, in the past. He’s like a dog whose only talent is to bark longer and louder. He’s got endless energy for the fight
I think that's because he has the most skin in the game, and thus the most to gain or lose from any confrontation. I have no doubt that he is convinced he is right, and that helps keep him going. But more than that is the need to keep his reputation intact among as many of his followers as possible, since they're the source of his funding and can bring more people to his channel, and thus to his Patreon. And, not incidentally, they keep his ego well-fed.
I believe him when he says his current efforts are exhausting. There are simply too many fires to try to put out, and he seems to throw himself into any effort at fighting back when people call him out. I mean... he's plowing through the comments section of Kim's video, responding to as much as he can, even though he seems to understand how futile it is. But he can't help himself.
And let's remember that moderation doesn't seem to be his strong suit.