Liability insurance policies of most stores result in their telling employees not to personally tackle a thief. It might be that Walmart, being as big as it is, doesn’t even bother having an insurance policy. It’s cheaper for them to handle such affairs in house.
There oughtta be a warning sign on the front door:
“There be rednecks here and they will rassle you down if you steal something! So don’t try it!”
You’re presuming they can read.