As powerful as you are you are not omnipotent. We even proved that even Thanos isn't all powerful. And let's face it. None of us were at our best when all of that went down. We were all blindsided emotionally and physically. We had never faced anything like him before. We weren't ready. We all made mistakes.
No matter what argument you come up with, my friend, I will have an answer because you are not evil.