It is possible! I think it would help if Cubia knew what he died for. I'm not entirely sure how it would happen, but Cubia really isn't cut out for hating people. He can do it! But it's more an urge rather than a real... reason sometimes. He hates things when he doesn't have control of them. But being dead would make him realize that life's not about that! It'll take time, though. Right now, Cubia is just sort of dispirited.

If Cubia keeps avoiding Kaworu, what will he do?