Well my question is why do you think there needs to be one? Scum already has a good win %. Why do there need to be an extra unblockable kill?
most scum, including myself, just want to get through the day and let night actions do the work. I'm guessing many hosts developed as players using similar tactics. it's a way to help scum deal with someone they can't manage in-topic. actively playing as scum is hard, and even if you're trying to coast, it can be stressful. I think hosts cater to that. recent games (for me) included 2 or 3 of: assassin, janitor, paralyzer. I don't think we should ever have paralyzer in our games and those other 2 should be used sparingly.
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to measure the meaning can make you delay
it's time you stopped thinking and wasting the day