No, that is a faulty argument imo. Saying it is the person’s fault whose leaving, or saying that those leavers are toxic people and the game is better off, etc, is just obfuscating the point OP is trying to make.
Needing to punish your players for leaving games to make for a better game environment is egregious, disingenuous, and covering up the fact that Blizzard can’t make a good matchmaking system or balance their game.
But this community relishes the chance to villify those that they think are toxic, so i’m not surprised the discourse is going this way.