As a part time Yooper with family members born and raised there I can tell you that they do not want the trolls (those that live under the bridge) coming across the bridge to hang out. Yes they rely on tourism. But their infrastructure is fragile and a burst of Covid in the region would be devastating. Their healthcare and other resources will do fine if we keep out, overwhelmed if we do not. This is true for almost all rural areas in Michigan. You can't close down a portion of the state hence the statewide order. It protects all regions.