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In my opinion, Neffele used to get the roles that involved eliminating players, and she certainly wasn't just sitting around. And overall, this strategy feels like a throwback to the mafia tactics of the 1930s, don't you think? Neffele simply wouldn't think of acting this way.
You're bringing up irrelevant points about unsuccessful kills. The BD cannot have unsuccessful kills by its very nature.
If Neffele is a negative player, then Uis is too: their daytime behavior is quite similar. For example, neither of them bothered to vote today.