People will sit on a glass throne feeling themselves morally superior, calling others names and judging them but then enjoy the very same content they chastize others for.
The wolf guy from Twilight tried to get in with a teenager, and when he couldn't win her affection, he started grooming her baby the moment she was born, that's pretty fucked up if you ask me, but all the twilight fans will defend it to death whilst throwing stones the very next day at a real life 20 year old woman being in a relationship with a 30 year old man.
I've seen the same thing happen with LiL since its first inception. You say Sensei is a horrible person for fucking teenagers but you still enjoy the content, you still jerk off when he fucks them and you even go so far as to SHIP him and hope that he does end up married to some of them in the future.
This very same guy you judge, you are ROOTING for him to keep doing the same.
You can call it a guilty pleasure, argue that it's fantasy, defend it or lie to yourself all you want, but the truth is that you LOVE the story about a teacher grooming his underage students.
I am of the opinion, that deep inside nobody really gives a shit.
Humans are social species so they do everything they can to not be seen in a negative light, and that includes conforming to popular opinions even if they do not believe in them themselves. Often the people that bash others the most are the ones hiding the most fucked up desires, just like all those hollywood pdfs or that one Anti-gay bulgarian politician who got caught participating in a gay orgy.
You like this game because this is what you actually like, and there are no repercussions for it.
You know that the things the main character does are bad, but you still root for him because you want him to take responsibility.
You fantasize about some of the girls, because that's what someone does when they want to fuck someone.
The goal of this game is to make you grow as a person by exposing your true self,
letting you know that you are not a bad person just for liking cute girls,
and to depict the repercussions that your weakness will inflict on some people.
Wanting something is not bad, but taking it is.