Sweden never closed down, and Germany is in the midst of reopening. As to the safety net—there is no evidence that safety net has made a difference. (I’m part, I suspect, because the Us already has a comprehensive safety net for the elderly population that is mainly affected by COVID-19). The death rate in the US, per 100,000 people, is well below that of Sweden. It’s also far lower than the death rate in countries with well developed safety nets like France and Italy.
I strongly suspect that people in Germany/Sweden, etc., have more trust in their government because the people themselves are simply less far apart. To pick a controversial but illustrative example: in Germany the outside limit on abortions is 12 weeks—shorter than in any US state. (Excepting a few “heartbeat law” states where the laws have not yet taken effect.) But within that period, abortions are generally available. No such compromise is possible in America. The right is currently focused on ending abortion entirely, while the left is trying to extend abortions into the third trimester (which are pretty much unprecedented in Europe). Or take taxes. Many in the right want to dismantle the existing tax system. But on the left, they treat lowering corporate taxes to the same level as Sweden or Germany (and France and Canada, etc.) not merely as bad policy, but as an affront to morality and decency.
The same is true for COVID-19. In every European country, there is a grown up debate about balancing health and safety with the need to reopen the economy. The American left, meanwhile, has condemned even the idea of such balancing as racist, classist, colonialism, what have you. The left greeted travel bans—which countries from Germany to New Zealand to Denmark have imposed to great effect—as manifest racism and xenophobia. They’re not talking about reopening, as Europe is already doing, but sheltering in place through the rest of 2020. The right, meanwhile, is shouting “give me liberty or give me death.” There is no trust because everybody is crazy, and everybody hates each other, and we should give up being one country and disband the union already.