I lived in the US for many years of my adult life, and voted there. I don't live there any more and can't vote there, but I'm still invested in and knowledgeable about US politics due to family and personal ties - what happens there affects me and my wider family and network, and also the wider world.
I covered the key topics - economy, environment, immigration, foreign policy, character pretty clearly I think. They're not anodyne topics, they're the most fundamental as any glance over any party manifesto will show you.
I didn't believe you posted in good faith because if you know anything about politics, you wouldn't characterise these topics as 'anodyne'.
If you don't know anything about politics, then you're still posting in bad faith, because how can you so confidently characterise certain themes as only personal if you don't understand?
I could go and seek out sources for you but that's not my job. I posted facts, you can go look them up if you like. I don't submit to be evaluated by you.
If you think posters should be more like what you characterise as typical in the UK - in your words people with strong views can usually explain really well and briefly why they vote one way or the other then, to be brief:
I don't agree with Trump's policies on all key issues including the environment, education, the arts, the economy and foreign policy. I think they're radically unjust and will cause suffering and deprivation of rights for most American citizens and endanger the world. Furthermore, I think the leader of a country should have an admirable character and I find him to be a very poor role model due to his obnoxiousness and self-centredness amongst other things. In general, I wouldn't vote for Republicans as they have nominated as their representative someone who encouraged a violent insurrection and threatened democracy, the political system I believe in.