Well, nothing can be guaranteed, but if you don't try, then obviously there won't be any result. I personally would be willing to cooperate if I saw a situation that was conducive to it (of course, it would be good to have some guarantees for this, but a revealed Mafia member, and one who wasn't revealed too late, already looks like a good basis for cooperation. Handing him over = at least he can be isolated at night).
Besides, I was thinking that in a scenario of "5 townies, 4 Mafia," the chances of convincing the town to vote him out will be lower, of course, but on the next day, when there are "4-5 townies and 3 Mafia," and the serial killer has also used his ultimate ability and stolen votes, then I might even suggest that, yes, it's time.
>The ultimate ability is one thing, but the question of "when and how you were going to get rid of him" remains...
Partly -- with your help. Obviously. Everyone plays against everyone, so the calculations are made accordingly.
And at night, there were options, although after the serial killer's ultimate ability, things were really on a knife's edge.