I see a lot of people, who would go attack some child, if they got harmed by some bad dude. At the end, smacking kids is much easier than challenge tough guy who was able to harm you.
MC has no doubt about who is the cause of his suffering and he is making plane to hit him. Why waste time on petty revenge to pawns, when culprit would escaped in such cause. He is planning to use them, instead sulking in the corner, how little they cry for his past.
And yeah, somewhere on the path for revenge, it will be decision between Luna`s forgiveness and Arka`s use them. But we are far from there.
And what exactly is MCs plan currently? How exactly he plans to become stronger?
By being good pet to his mother and sister and Azel and good student at human school? Could he train in hell, obtain army, copy powers, then challenge heavens? Sure, but that would make too much sense and involve too little sex scenes.
It's not about lashing out on kids or "family", it's about leaving them behind and treating them the way they deserve to be treated. And that's to stay the fuck away from them. I see 0 benefits to him enrolling to college and learning human manners.
Some speculate he wants to potentially use them, but that's not what his inner thoughts are leading to. His inner thoughts are forgiving his family and seeing it as "I overreacted" "I shouldn't have treated her like that" "She was just following orders". Those, after hundreds of years of torture, make NO FUCKING SENSE. MC is feeling bigger guilt over treating them badly than they are feeling ANY compassion for what he went through.
His attitude took complete 180 after leaving hell. I know it's for gameplay purposes (and creating romances), but it's jarring how badly it was done. Slice of life DOES NOT suit this game. At all. The jokes Azel was saying and mocking MC would be fine in college based VN, but in a game that starts with hundreds of years of torture + death of only person that's shown any compassion and understanding of MC, it's ridiculous. Beyond ridiculous.
Even if they acted that way, his reactions to that should have been angry, moody, yes, even edgy.
It's gonna take a miracle for dev to dig the story out of that hole he dug himself into with chapter 2. Or he can double down on it, turn the game into more of a kinetic novel where players make very minor decisions (who to sleep with for example) while everything else just plays out without player input (see that mafia family game for one such example).