if you kill someone unlawfully (also a matter a definition) this is murder. no matter who that person is or what he plans to eventually do.
who are you to decide if the utter destruction of the earth and all of its inhabitant is not for a greater good in the end?
its relevant to the discussion since evil and good are purely based on perception. there is no evil. a wolf devouring his prey is not evil. a human killing someone is not evil. you, for one reason or another may consider it evil. which is provably circumstantial.
not addressing that hitler nonsense. morality is subjective. stealing is immoral in my opinion. not in general though, as stealing from someone who is extorted money/possession from you (lawfull or unlawfully) does not seem so immoral anymore. at least not to me.
what exactly makes you pick Kaladins side (the invaders) in this over Moashs side (the original inhabitants)?
Kaladin himself realized that the revelation that Parshmen were the original natives of Roshar was what broke the last Radiants. unlike them Moash made a decision instead of being conflicted. he choose to fight for the side that he considers to be the right one. that does not, by any means make him or his actions evil.