The same analysis applied to the customer. Allowing carry was suggested to add liability to the store from the actions of the customer. There wasn't strong support for the customer lawsuit.
One reason in the modification of the TX signs, they were made so obnoxious that stores wouldn't want them for negative PR. But you do see them. For instance, car dealerships in San Antonio that are owned by Red McCombs - a real 'tough' guy - have versions of the 30.06 sign. Some are legit and some not but here's a tough guy, gun friendly, conservative business guy who bans.
I've seen a couple of business analyses that you should allow carry and the risk isn't that much from the lawsuit of the concealed carrier gone awry but no suggestion that it was to avoid a suit from someone who couldn't carry.
As far as not going to that business - well, when I'm in cardiac arrest or with several broken bones - I'm going to the hospital even though it has signs.
- Seriously, there are some places with bans that I cannot avoid.