I got my first two shots along with my wife at the Wellstar Clinic where our Doctor practices. Our Doctor agreed those drive locations were a greater risk of not being effective, but I suspect it may have been, as you suggest, intentionally harmful under questionable situations.
When they began talking about the boosters we had had enough of the shenanigans and now I'm doubly glad we didn't get boosted.
The one guy asked the other guy "did you jump when you were boosted?" Yes, a little at first.