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Final braincell created a topic of Kill Me If You Can

I don't understand why he's so disappointed, like he creates them to literally become a murderer why he so angry when the doppleganger is doing what it was thought to do? (To clean the evil in mankind)
And he completely disregarded him when he was the whole world to that doppleganger how can he just discard him like that???
I would be torn apart as well