It's not false that teaching has seen terrible attrition since 2020, and I know personally of several early-in-the-pandemic "go back, in-person only" efforts that were scrubbed because the number of teachers who were ready to walk was high enough that it would have shut down the entire school district. This, in a purple-leaning-red area of a red state. I assume resistance in blue states would have been even higher, but admit it's possible that my sample of three suburban districts in my area and one in another state weren't representative (every single one saw this happen).

[EDIT] It can both be true that Sweden did fine but that US schools would not have. It depends on how teachers perceived the situation. I bet parents and students in Sweden took distancing and avoiding gatherings more seriously, and didn't send their kids to school sick as often, and that may have made teachers feel more comfortable returning. I know a private school in our area that had far fewer illnesses after returning in-person, because they'd selected, in advance, for parents who weren't assholes, so adherence to spread-prevention efforts was much higher than at local public schools (plus the parents were richer and more likely to be able to avoid going in-person to work, to be fair). Meanwhile public schools were having to stick multiple classes in the cafeteria for babysitting by vice principals and such a day or two a week, because too many teachers caught Covid or had close exposures, and they couldn't get enough substitutes—and this went on for most of a year. The attitudes and situations of everyone involved made a huge difference (I bet much higher amounts of paid time off even for low-wage workers helped Swedes cope with it better, for instance—the temptation to send your kid when they're sick, because you're out of days of all kinds and can't afford to miss the hours, in the US, is high)

Didn’t they also not have any lockdown at all? How did that turn out?