Here's a fact, RP has improved on CF. Why? Not because the imms stood in a corner jumping up and down yelling RP BETTER DAMMIT. But mostly because the playerbase started to.

By playing a character with stellar RP, you create a sphere of influence. It might not be large, but if by setting an example, a handful of other players also try to RP better, than it can blossom. This is how things change in CF, evolution rather than revolution. Stop trying to lead a revolt, nobody will follow you.

When you see someone healing at the Arkham healer, try roleplaying how offensive the idea of being infused with an evil god's powers is to your character. Sure, you might not change the behavior of that one player in this instance, but then again, how is your current approach working for you? Your problems is that you the player get bothered by it instead of your character and it comes through as an entirely OOC issue.

Personally, I'd rather interact with players who heal their good characters at evil heros but RP other aspects of their character very well, then players who OOC'ly get bent of shape by other players bad RP. If you can't get past those things bothering you to the degree that they ruin your own RP, you are hurting CF more than helping it.