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Your logic is very sound hex. For me, it just more or less my personal taste in how I would’ve like to see Thanos just end it all. He snapped and killed half the population, I personally wanted to see him take it further by killing all the Avengers lol. Anyways, just some rambling thoughts of mine.
Thanos is not evil. He doesn't see himself as a cold blooded murderer and only murders when he has to.
Also he didn't kill half of the Universe. As he himself said "I can click my fingers and they will simply cease to exist. I call that mercy.". Yup mercy because not existing is more gentle than being murdered and is not the same thing. Being blinked out of reality is how I would choose to go if I had the choice.
If a vet has to put an animal down they will choose the least painful way. Thanos had no choice in the matter and was trying to help the selected half to vanish in a painless way rather than wait for their inevitable death at his hands.
Twisted logic I know but it is internally consistent and that is what makes him compelling.