Do we? It is arguable that much of what people are referring to as a 'lockdown' was voluntary and would have happened in any case. Especially early on, there was surprisingly little variation between jurisdictions that formalized it with regulation, and ones that did not.

Schools are the biggest one especially since data seems to indicate it did nothing to improve covid outcomes.

This research on the neurological damaged caused by covid suggests that we objectively don't yet understand the long term impacts of covid infection. Given that something like 40% of the US has contracted covid at least once (per CDC), even a small effect on the age-incidence of heart attacks or strokes could cause major social and economic problems in 20+ years.