I think each area can and should take the local situation into account. My understanding (as an American living in the UK) was that they are doing so, to a large extent. From what I can tell from friends and relatives on FB, restrictions in Michigan came on hard and strong after being probably one of the worst hit early on; restrictions in Ohio started earlier and never got as tough. The anti-lockdown side of my FB feed seems to think that South Dakota never had much of a lockdown to speak of at all.

I don't claim to know better than local governments what the best decision is -- we're all just making this up as we go along, and I'm glad I don't personally have to make the decision between massive death or economic damage for millions of people.