Glenn Beck and gun registration
Glenn Beck is a fairly brilliant guy and he deals in this show with a lot more than guns, but I think that this is one case that he could make his argument stronger with respect to gun control. Registration programs in Hawaii, DC, and Chicago can't point to any crimes that have been solved as a result of registration. In Canada, the government claimed that since the 1930s it could point to three handgun crimes that registration solved. I believe that long gun registration still hasn't solved any crimes in Canada. (All these figures are from a few years ago, but I don't believe that anything has changed.)
Why? The theory is that if a gun is registered and it is left at the scene, it could theoretically be traced back to the owner. There are a couple of problems with that. 1) Crime guns are virtually never left at the scene of the crime. When they are left at the scene it is almost always because the criminal has been seriously wounded or killed, and thus you are going to catch the criminal anyway. 2) Even when the crime guns are left at the scene they turn out not to be registered to the criminal who left them at the scene.
While Beck has few equals in getting ideas across to people, I think that he is making a mistake in this case by letting the debate be set up as freedom versus safety. Freedom and safety go together at least in this case. Registration raises the costs of law-abiding citizens getting guns relative to criminals. Of course, if guns are eventually confiscated as discussed in the show, gun bans only end up with criminals having guns.