> Though for some reason, they strongly support illegal immigration, and seek to decriminalize it through so-called "sanctuary cities", rather than starting serious efforts at making permanent legal immigration liberal and approachable for most people.

Like DACA?

> It's a driving factor in the Opioid Epidemic.

Most opioids coming through the border are happening via ships at ports, not via immigrants. Not saying they don't bring drugs with them - but not remotely at the scale you describe.