Well, the employee is "supposed to be" a professional. Anyone going into that store has a right to expect them to at least know how NOT to shoot the customers. Besides all the other reasons, it has to be bad for business when someone is air lifted from your store. Hopefully the customer comes out of this as good as posssible.
Guns don't kill people, fathers with pretty daughters do.
Two wrongs don't make a right, but three comes pretty close.
Proud NRA member