Because he revealed himself. Because there are no peaceful roles that fit him; he might be able to claim the role that the Master reveals (and even that's not certain), but he doesn't even try.
Isn't it enough to just have thoughts and statements that can be applied to the available roles and get a reasonable result?
Added 4 minutes later
How many players are sitting around without a possible role, who are not noticed or ignored?
I am being active, trying to contribute to the common cause. Look at your posts, Fragment's posts. How much confusion was there yesterday evening, this morning. And we are talking about people who have an opinion.
And regarding Morning - he will still draw some of the Neutral Mafia's attention to himself, which is already useful for the town. The Mafia cannot redirect actions and will clearly be afraid of the actions of a serial killer. If I were Mafia, I wouldn't so openly "remove" the "lifeline" that is necessary for the town.
Плачущее небо под ногами