@l-sama You know, I actually was thinking about that series. It still doesn't offend me as much as Re:Monster, although I admittedly didn't read too much into it.
The big difference I think is that in Maoh no Hajimekata, we know off the bat that he's a bad guy. It's in the name of the title even, the main character is not supposed to be redeemable. Not to say it's good, but at least it's obvious up front what type of story it's going to be.
Re:Monster offends me because it sneaks up on you with that shit. It has the gall to give Rou some sort of moral objection to rape and then turn around and basically have him commit rape anyway. All the while comment about how virile and strong he is, it's revolting.