In the end the big bro ends just as weak as he started, he has become dependent on his abu...

It's kind of crazy if you think big bro deserves it. He was raped, tormented and binded to him in so many ways repeatedly. It went onto the point till he broke - he became impotent and believes this is what he deserves. After all he has gone through (he tried to kill himself) his natural response was to deny the more positive things that came into his life too late (his mind has already "snapped" as the little brother gleefully told hanabusa) as he feels like he deserves nothing but shit. People come down to this mindframe from suffering so little let alone what Haruki had to go through. The only was he can continue to live now if at least someone who knows it all accepts for the "monster" he is. Classic case of toxic codependency, learned helplessness and Stockholm syndrome. Putting all that aside, he is a victim for the love of God. How does he deserve any of this. The little bro went through shit when he was much younger but that gives him no right to inflict this kind of pain and horror onto the person he "loves". The rationale behind comments like yours just make no sense at all.

If that is your opinion but speaking as a victim of abuse it's like a living hell and my attacker is family so I can't understand stand those who'd latch themselves onto their attacker that is how I feel, if your twisted enough to fall that deep then you deserve to sink in it, no matter what he was missing strength and no one can give that to you it is something you must attain for yourself so no matter how heartless my comment may seem it likes yours carries truth in it, it doesn't have to make sense to you just like you giving him excuses to run back to his abuser doesn't make sense to me two sides of a different coin I guess...