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I don't see any reason not to lynch Ment as the mafia. The point about the weak justifications yesterday was also well made. We also need to clarify with Nebki about the second piece of evidence.
As for why he's the mafia – because he has a double vote, and the town hasn't suffered enough yet to be unable to do anything about it. And then he'll kill two more people. There's no Serial Killer, and even if the Serial Killer gets him, it won't be a problem.
Regarding the mafia blocking their own – I agree. It's unlikely that a rational town member would block him based on suspicion after he's already played (there's also not much point in blocking anyone else). And a block as a non-directional defense doesn't change much for the mafia, especially without a Serial Killer or evidence against him. There are also no other secondary non-directional defenses, so it's worth trying, maybe someone will react.