the average Less Wronger is about 33% more favorably disposed towards the feminist movement than the average woman

Maybe that's exactly what makes LW a good target. There are too many targets on the internet, and one has to pick their battles. The best place is the one where you already have support. If someone would write a similar article about a website with no feminists, no one on the website would care. Thus, wasted time.

In the same way, it is more strategic to aim this kind of criticism towards you personally than it would be e.g. towards me. Not because you are a worse person (from a feminist point of view). But because such criticism will worry you, while I would just laugh.

There is something extremely irritating about a person who almost agrees with you, and yet refuses to accept everything you say. Sometimes you get angry about them more than about your enemies, whose existence you already learned to accept. At least, the enemies are compatible with the "us versus them" dichotomy, while the almost-allies make it feel like the "us" side is falling apart.

EDIT: Seems like you already know this.