His obsession with being seen as normal and not to let the MC to see his behaviors as not normal. Due to society viewing heterosexual relationships as the normal standard it has twisted the Semes view on homosexuality.
The fear of slipping and loosing MC is what drives him to keep the "normal" persona. He doesn't understand how he hurt tha MC or that there are different types of normal. He was taught he had to be normal due to the abnormalities in his personality. Many cultures still view homosexuality as abnormal.
He doesn't feel hatred or disgusted by them, because he doesnt feel. He's just a mirror reflecting back what he believes is expected of him by those around him.
The mother did not kill herself. The father did because she wanted to get Theo away from him.
So I looked back through to see where the two cassette tapes came from. The yellow one is from the Van and is the guy who lost his memories. The sea foam green one Doha's save. I think he keeps it hidden so he can resave every time.
The cousin found the tapes and recognized them. I think he snaps his neck so another NPC doesn't bother them like the last NPC did. He wants Bada to himself and the game is keeping Bada close.
Remember how Doha killed that civilian. Well we see the civilians attack and Doha could have been doing it in self defense. Though I wonder if he actually awakened before and that's how he knew or if he is a player and not an NPC. Guess we'll find out next season! Can't wait!!!