If you want to go for 'herd immunity' or whatever you call it - which unfortunately until there's a vaccine is the only long-term solution - you have to ensure your healthcare system can hack it.
So you spend a month or the six weeks we had pumping as much money in as possible. You get the extra hospitals ready, you get the beds ready, the ventilators and PPE. You have the tests ramped up. You do all of that.
If it turns out you've overreacted, fine, but what it does is buy you time and that's what was needed.