I've seen this "kill fandom cops" image passed around, and I think it's actually a perfect case-study of why "furry discourse" keeps happening.
Cuz thing is, the person behind it doesn't actually agree with the message. She said herself that it doesn't apply to cub, which means she does actually think certain fetish material should be unacceptable and "policed", she just wants "the line" to be drawn somewhere else.
So why did she make this image? Because it's provocative, and provocative stuff gets more clicks than nuanced analysis. Social media algorithms encourage people to tout extreme opinions, even ones they may not necessarily hold, because that's what gets them views.
It encourages people's worst impulses, to view everything in black-and-white and resort to gotchas, roasts and harassment over genuine discussion.
It's the same thing we see everywhere else on social media, and something we should work to avoid so it doesn't become the case here too.