Safe, yes. I have never felt unsafe in a Michigan State Park, except once when a shotgun went off VERY near our rig late at night. They did not pull any bodies out of there the next morning so I guess it was someone being a bit full of adult beverages, OR well, not sure what.
They could have been on the lake in a boat for all I knew.
I felt more "unsafe" in a private park here in Michigan where the guy checking us in was packing a pistol on his hip, something that is not normal in my experience.
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Edited to correct the horrible auto correct messes from the iPad. LOL