I'm not a fan of excessive government regulation, but there are documneted examples of Rusty Crawfish displacing native species in areas after the use of Rusty Crawfish as bait. I'd rather we not lose biodiversity in our creeks/rivers/lakes because we want ceap live bait that's sold everywhere.
Lot's of stuff wrong with our government (state, federal, and local), but discussion of every law and regulation does NOT have to go there.