The scum can't do anything about me because I've done the math, and no matter who the remaining scum is, there's a more important target than me.
Alright. Let's proceed from this premise, then and see what scenarios we'd be looking at. From a neutral bystander perspective he scum have four feasible targets:
LMD
Dechs
Imopen
CK
They won't target LMD, because he's less of a direct role-based threat to them, as far as they know.
If they target CK, he's proven to not be a liar, town *should* lynch Imopen and Red, and win.
If they target Imopen, *I'm* proven to be a liar, I die, town wins or searches for my buddy, probably CK, and probably wins.
But I think there's a pretty decent chance they'll target you, Dechs. You seem to think that they won't do that, because of the threat of Imopen's subsequent investigation and CK's vig-kill. But neither of those are real threats.
CK's vig-kill is only of value if using it doesn't end the game. In a no-lynch scenario, it will. CK could theoretically use it on Imopen just to see if it's going to be blocked a 2nd time, but if you didn't believe him the first time he said the kill failed, I don't see the use in repeating the exercise twice.
Imopen's investigation is only valuable if it's believable/tells us something new. It won't. Tomorrow, he'll almost certainly investigate CK. And he'll say CK is either or town or scum. But we'll still have to decide whether we believe him, or not, despite the fact that his ability could have been tampered with a 2nd time, according to your theory at least. Imopen's investigations do us no good unless we know we can trust Imopen, and if you think his results can be tampered with, they're worthless to us.