I was in the States for a month in the lead up to the election. I spent most of my time in Philly and Nashville. The locals I spoke with were all very nice and were happy to ask me about Scotland/the UK and our political leaders. I didn't detect that much ignorance tbh. I met a really cool guy in the gym who was a Republican voter but was disillusioned that his party (in his opinion) had been hijacked by MAGA.
My feeling was that the economy/cost of living was the no.1 reason why people were voting for Trump particularly in swing states like Pennsylvania. Next followed immigration and then other issues like abortion. Roe v Wade was discussed a lot more than Europe not paying it's security bills - this has only become more prominent lately due to Trump talking about it regularly. I didn't get the feeling it was a key voter concern leading up to the election. I'm sure there are polls with more accurate data but this was my experience talking to people.
Elections in the US feel very partisan - almost like a cup final between two rival teams (red v blue). You pick a side, cast your vote and then become deeply entrenched in your views in order to validate the decision you made to vote a particular way. Not many people are going to hold their hands up and say they got it wrong - especially this soon after the election. Trump's inauguration speech mainly consisted of attacks on Biden and his record. There was no unifying message and no attempt to reach out to voters who didn't vote for him. It's no wonder there was a sense of "We won and you lost haha - you suck". If the tone from the top doesn't include a message to unite and heal division then it really doesn't bode well for society in general IMO. Btw, not saying the British political system is perfect - far from it. Just sharing some observations while I was across the pond.