Because your lynch doesn't make sense from a town perspective. You contradict your own reasoning for lynching him. "I don't think he can be town killing" — "However since its done by rng , its totally random.ha001 could be scum."
So he has equal odds of being both, but you immediately toss away town killing for him? It feels like a lynch on a new player on flimsy paper that has no ground to stand on. You asked about how many Town Killings, well, it could be two or three. So if you think there's only one you're off. That can't be your reasoning for lynching him.