Spitfire, I don't believe you're the scum. You're new, but haven't dropped much in the way of scum-tells, despite pressure. By process of elimination:
Magmadeath, you are the scum, although you've done your job well and I doubt I can convince Spitfire of it, yet I must try.
Why didn't RNG cast any suspicion at me? I see no reason why he should have, if his partner was on that. Bonus points for planning ahead and not poking me. I don't know if you bussing him was planned or not. Maybe he wanted to drop out of the game, but do what he could to ensure you won rather then ask for a replacement. Accusing your buddy and some other person of being the scumteam shortly before bussing him isn't an unheard of trick.
Why Cheddarius was lynched: You were afraid of a doctor protecting him last night, and couldn't have Cheddarius confirming me as town. You'd hoped it would work against me, as the odds of probability aren't in favor of me being town.
Why me as a target: Grudge from me getting lucky against you in BM6, perhaps? Or perhaps the plan to accuse me of being with RNG came when it was too late for him to paint anybody else with the "lack of suspicion" target.
Why Spitfire: He was the one who pointed out that RNG didn't try to throw suspicion on me, and he's new. You figured that, with him already slightly against me, you could buddy up to him easily. It's worked.
Why Alsark and Monk were killed: Alsark claimed to be experienced. You feared he would be better at finding you out then me. Monk, as I said, was likely to be replaced by an unknown.
Why haven't you voted me yet: You said a while back that you thought Spitfire was dropping newb-tells rather then scum-tells. You've been hoping I said something you could use to use to accuse me of slipping up with with for a while, at least since over-dissecting my guesses yesterday. You've also been slowly trying to buddy up with Spitfire, to make sure he would side with you. I also think you're afraid of me. Afraid I'd be able to point out your weaknesses if you did strongly attack me.
Spitfire, the game rests with you. I urge you to re-read this last day first with the point of view that I am certain scum, then with the point of few that Magma is certain scum. Choose well.