For me one of the most recent things I’ve changed my mind about was my stance on (Finland) joining NATO. I used to oppose the idea because I was uninformed and thought that if a member state somewhere far away gets attacked that means I’m almost guranteed to be sent there fighting. I also didn’t think an actual hot conflict was a realistic threat in the civilized western world or atleast that the possibility of something like that was extremely small. Suffice to say I was proven wrong.