High initial rates in communities might mean they have reached herd immunity and will be protected from subsequent waves.
I don't know what the health message is in the US but our Chief Medical Officer said Herd Immunity doesn't work at about the end of March. Herd Immunity basically means that everyone gets it, so with a usual 1% mortality rate that would mean 3 million dead in the US. It might mean that your kids become immune but it doesn't sound like a workable plan to me.
What works is washing your hands, social distancing and if you don't need to go out, then stay at home.
Most of Australia has been clean for some time but we just had an outbreak in Melbourne (5 million people). Only about 150 cases but they have closed the city at a radius of about 40Km and NSW has closed the border to the state of Victoria using 1000 police and army. Hope it works and quickly, as we have just opened up most businesses.