@twinklecake If i had a problem with the MC being unashamedly evil i wouldn't even be reading this in the first place.
But there is a difference between "no holding back/unashamed" and "literally gratuitous".
Everything he has done up until now clearly shows he is an amoral bastard but IT BENEFITTED HIM in some way or another.
Be it getting informations, getting laid, getting money for liquor, getting a spy.....he got something out of his evil deeds.
This? This was literally DETRIMENTAL to him, since brain surgery becomes a lot more difficult if the subject is thrashing and screaming compared to unconscious.
Doing something whose only effect is to make things worse for you is straight up stupid, and goes against his characterization of "twisted genius".