Because if you don’t like your healthcare in the US, you certainly can leave, but you will be stuck with the bill, and if it’s considered leaving “against medical advice,” you will be denied insurance coverage if you return for the same issue.
Insurance is just a pain in general in the U.S. For instance some people might struggle to find a new doctor in their area if they’re dealing with a specialist and have specific insurance coverages which means cutting off their toxic doctor might be more difficult.
Burning bridges to escape toxicity is fine, just don’t strand yourself.
This might be a bold assumption on my part but I would say most normal people do not have the energy for the craziness that occurs on a lot of socials now.
You want to engage and be a part of the community but it’s just far too exhausting in many cases. Easier to just browse most of the time.