Under this logic, if someone drugged and molested your sister or mother you would be cool with them not being in prison if your sister or mother ended up giving him the D afterwards. This is very gross. I 1000% disagree this is an evil character through and through.
I dont care if he spends the rest of his life giving to charity and living as a fucking monk. If he does not repent and express remorse for this behavior he is an evil fuck. Not to mention thats just one example of what he has done. Part of the fiction is that these women are attracted to him despite his evil and fucked behavior. Like in the narrative the only reason his sister jumped his bones was because he was persistent on molesting her while drugged. And she does not seems to give a shit if he peruses other women, 100% carnal even though she was a virgin.
No this is all fuck shit and yall are gross for thinking you can be a "good person" without remorse or repenting of this behavior.
If the my mother or sister genuinely loved em and I knew this wasn't just a case of "stockholm syndrome" I would come to terms with it. This isn't a case of just them giving him the "D", it's them genuinely liking the person. Because it's a fiction you can't really call it stockholm syndrome because for the most part, the MC wasn't literally forcing them to have sex and they are the ones who approach him afterwards.
Like in the narrative the only reason his sister jumped his bones was because he was persistent on molesting her while drugged. And she does not seems to give a shit if he peruses other women, 100% carnal even though she was a virgin.
Then you missed the aspect of the sister liking him from the start but being the standard "tsundere" character type. And you also forgot that him molesting her while she was sleeping didn't really do much other than make her hornier and she chose the MC because she was already attracted to him.
+The women aren't into his evil personality and he hasn't actually shown it to others, other than the masochistic tsundere character (And that's just his sadistic character type, which she'd be naturally attracted to).
You say the person is evil and he needs to repent. Like what the hell is your issue. Other than making someone horny so that they'd get that push (Because like mentioned before, that's the only effect the drug has), has he done anything genuinely evil? Because when I talk about evil I think about people who genuinely brainwash others to be their puppets like cult leaders, this is not the case here and it's not even close. The MC is humane and while he isn't a morally great person and yes drugging ppl is IMMORAL, he has his reasons and he isn't abusing the women (Other than the tsundere who likes it).
He doesn't need remorse because like I said before, the drug is only an activator and something which speeds up the events for him (He isn't literally brainwashing them and they still can be who they wish or keep away from the MC if they so wished). Not to mention that he is still focused on what happened to his father, aka he might still have some remorse if the Author wants it later, but like I said that's not exactly necessary because of my aforementioned points.
In real life there are a lot of issues which would pop up, like a possibility of stockholm syndrome and the aftereffects of the drug, while in a fictional situation that's not the case. What you see in the story is how it is, IRL it's different. You bringing this whole BS thing into this is unsettling, because you seem to have difficulties separating fiction from reality and seriously seem to take offense to a game.