Criminals aren’t going to be stopped by a “no guns allowed” sign.
Check it out:

North Carolina restaurant The Pit was robbed at gunpoint on Sunday. Normally, local crime stories like this wouldn’t merit a Townhall post, but this one is different: The Pit has a “no weapons” sign displayed prominently on its door declaring the restaurant a gun-free zone, and bans patrons from carrying concealed weapons.

Authorities said just before 9 p.m. Sunday, three men wearing hoodies entered the restaurant through the back doors with pistols, and forced several staff members to lie on the floor.

The bandits assaulted two employees during the crime, but they were not seriously injured.
What groups like Everytown for Gun Safety or Moms Demand Action for Gun Sense in America seem to have an issue grasping is that criminals have no respect for the law by nature of being criminals.