I don’t give a crap, really, about Trump’s wall either way. It’s stupid, but it’s minor stupid. It won’t help much, won’t hurt much, and the main negative impact will be ecological.
For the left and so-called liberals, I think their de facto open borders stance is a huge loser and a bad idea generally. I suspect that if they mostly backed away from open borders fetishism and virtue signaling, they could probably pick up another 5ish percent of Republican-leaning voters and win far more elections.
I will never understand how it can be that many leftists and progressives tend to value people who aren’t citizens and don’t live here over legal residents and American citizens, but they truly do and it’s pretty disgusting.