Because think about it
Kratos' characteristics and motivations aren't actually that big a deal. If somebody pisses him off in the afterlife, he would just resurrect himself to kill them in the face again. It's not at all hard to write him back into things in a realistic way. And you'd get Kratos awesomeness for the rest of the game. It's dumb to not enjoy a franchise just because the developers disagreed with you on the progression of a character.
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