> But there are reasons people want(ed) to move to the USA, and I don't mean refugees

I think overall you are correct but probably still not safe to generalize. If you're moving to escape persecution then just being "on the other side" achieved this. If you are economically motivated then just leaving doesn't guarantee anything, you can be worse off. This circles back to the idea that the people who are persecuted by a regime paint the public opinion of that regime.

I have friends from Eastern Europe who emigrated to North America (mostly Canada) in the early '90s only to move back shortly after when the reality didn't live up to the hype and their expectations. They had a better life back home. The move was economically motivated, not escaping persecution. Many families under authoritarian regimes had the option to move to a Western country but not being actively persecuted meant they had no hard push and decided for the "comfort of familiarity".

East Berlin slipping into authoritarianism is a good showcase for this. Most people chose to stay in place for long enough to build a wall. We're talking years in which they saw the reality around them but only the ones who actively suffered from persecution chose to leave. Today plenty of East Germans still look back fondly at those times because they didn't feel the objective pain of persecution, only the subjective general suffering of "I could have better but don't".