We still having Bush Garden. No metal detectors there! And always remember, the only thing good against a bad guy with a gun, IS A GOOD GUY WITH A GUN!!
Theme parks tend to want a good public perception, which is NOT the same thing as actual public safety. They'll take your money, and if anything happens to you there, or the hundreds of others there with you, they'll lament the lack of a secure America and provide a spot for the traditional flower memorial to all the victims they provided.