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That's the point of his character and what made him such a great villain, he has noble intentions. We are facing an environmental crisis, and Thanos is simply an extreme version of wanting to stop it. I loved that about him, and he had some good points.

The Avengers: Infinity War movie is formatted for you to sympathize with Thanos, at least partially. So, yeah, I don't think that's a bad reaction. When I watched Avengers: Endgame, the part when they were still oblivious of the possibility of time travel, I became very attached to the world that was left growing up and moving on in the aftermath of the snap. Really, I was genuinely okay with the moments where half of the world vanished, because people have moved on and accepted their own mistakes, instead of living with the guilt forever. I also was, for a moment, rooting a bit for Thanos, its actually a storytelling marvel (no pun intended) what the last two Avengers films directors and writers did to pull off a story where you could relate so much with the villain and its causes.

I personally don’t think that planetary geneside is the best way to protect the universe from overpopulation. By snapping Thanos believed that he was ending the world of all its suffering but he simply caused more pain by removing most people’s loved ones