Yeah, it was me trying to convince others that Citizen was a wolf, but I tried so hard I started to believe myself he was a wolf, and thus send him the PM.I send a similar PM to Sander.
What I do to prevent that is to keep a text-file handy (and visibly when I'm at home doing WW) with on top the known roles. And then I go through the thread, try to pick out what I want to bring the attention to with the eyes of a villager. Try to build cases against those who behave themselves suspicious (even though I know they're not wolves, it is what you can make the village believe).