One thing about Sweden is they're not doing that much testing. It's not **awful**, but it's pretty bad; slightly lower testing rates per capita than the US. It seems hard to know how well your unusually lax strategy is working if you aren't really testing people.

Related to this: so many parameters about COVID-19 are so uncertain that societies don't really know what trade-offs they're making. An underrated reason to have done/keep doing social distancing is simply to have more time to collect more data and evaluate evidence.