activism is such a hard road and burn-out is so likely

Yeah, and taking on the task of flaming the losers can be particularly draining. The reason you don't see more activists doing it is not because it shouldn't be done, but because it is so draining and they've learned to protect themselves by letting it slide.

So yeah, if you're feeling the anger and are up for the ride, go for it. Sometimes anger is entirely appropriate (usually, when doing activism).

Good luck out there!