Kiritsugu's choices and actions are by no mean "universal", let alone "absolutely correct". That being said, there is a line of logic and conviction in there, beyond simply being a "douchebag".
I can't say I entierely agree with everything he has done, but most of what he has done has a specific reason which is actually acceptable to some degree, moreso in this scenario due to the circumstances going against him.
I'm more disagreeing with the whole point that "he enjoys doing that" and "doing for the hell of it".
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