Just to put it out there, there seems to be some kind of "covering each other's backs" between @Finalbeta and @Poison chan I could be wrong, but that itself is suspicious.
Sorry for assuming ^^
However, even I have never played this game before but it doesn't take much to use it as an excuse to hide who you might really be. Playing the innocent card can only go so far.
Perhaps @Rei is the serial killer and he is looking for reasons to save himself. He sure is trying hard to find some solid evidence that could possibly cover up who he is, as there isn't much to go off.