Hrm....maybe it is just me then. Wouldn't be the first time.

A possible, simple solution for false downvotes would be a resign button. If something goes awry(real life, not liking the rp or the people in it, what have  you) click said button to officially quit, thus giving the participating members notice of leave and simultaneously blocking any undue downvotes in the system. I'm talking about the people who mysteriously vanish without a trace, leaving everyone else hanging or big holes in the story where a character used to be. The ones I'm talking about know who they are *squinty eyes*

But yeah, that still wouldn't stop false votes before officially resigning. Perhaps I'm simply spoiled by the lighteryears-faster roleplay action of instant messengers.