LogFAQs > #914460009

Good vs Evil on some act of questionable morality, let's narrow it down to killing here, is basically

Good = does it for the sake of helping others as priority one

Neutral = does it for the sake of some outside influence, an ideal, or whatever, guiding the decision that is neither rooted entirely on helping yourself or others. The Hulk as probably the best MCU example of neutrality just indiscriminately kills things that are in his way like a force of nature-- it's not explicitly evil because he's not really doing it in a way to better himself-- like he can usually just ignore these things he kills and probably would be no worse for it.

Evil = does it for the sake of furthering themselves as priority one

Respecting the will of the victim or the ones you're helping is also part of the equation, generally respecting their will leaning you towards good. And obviously you avoid killing whenever possible as someone of good alignment but when killing becomes the unavoidable solution to a problem that's when it gets sketchy.

Overall I would say Thanos as presented is closest to neutral due to a mix of everything involved, but yeah, there is a lot that's open to interpretation there.
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