Task Force 16 wrote:
Run the ad until the business decides that they will welcome OC, or they get robbed a few times...
...and you subsequently get sued.
Why would you get sued? You didn't force anyone to rob the business. You simply pointed out (while using the 1st Amendment) a particular detail about a business you felt others should know about. Not really any different than telling people about great or poor service from a business.
I am not responsible for anyone else's behavior unless I have legal custody over them.