Percentages

And? I'm not responsible for all the randomness, if you want to get down to it. I already explained what the issue is. Have you played as Mafia when some roles have one-time-use protections? When the Mafia knows for sure that there's a protection and it needs to be removed, they simply don't want to do it; they ignore it and choose another target, guided by the same randomness or some assumptions. They don't want to spend a precious night, which might be ruined anyway by a block/protection/heal, on trying to eliminate someone, so they usually leave those players, hoping that others will take care of them, and by the end, they don't have time to remove the protections anymore. The same applies to immunity to execution. The town drags it out, and then it's too late.