Newbie Management - Chapter 45

Did he really kill the daughter just for the sake of changing the demon kings gender?
I must say I grow to hate the mc the more chapters I read, because he’s so fucking dumb. I mean no matter how you see it how the fuck is changing the gender going to change his fated outcome.
I can see the gender change as a result of changing fate like with grain but I fail to realize why this would affect the outcome.
It’s not like the demon lord will go like “now I can finally be on the outside like I always felt on the inside, now I can finally die peace and I can finally release you from your regression curse”

MCs grasp on causality is just beyond my understanding.
It’s like he doesn’t acknowledge logic, everything is like a lottery for him… with a little luck he reaches his desired outcome.