How about metal detectors with armed security at any night club, theater, ect that is considered a "gun free zone." If your running a business that operates in a gun free zone, then it is that business's responsibility to ensure it's weapon free and the people attending are not defenseless.  If your not going to protect the people at these so called "gun free zones" then you need to give the people the option to conceal carry. Otherwise you will continue to see attacks like this and no immigration changes, no gun restriction changes or other lame b.s. Is going to change this. Both major parties are being rediculous about this!