Gun Control & RKBA

I don't. They reinforce bad behavior. They teach people that once the magazine is dropped, the pistol is safe. I have seen people drop the mag on a pistol with a mag safety and then bench the pistol with a round still in the chamber. This is a disaster waiting for an opportunity to occur. Inserting an empty magazine would render that pistol fully operable and ready to fire again.

Keep the device simple, and rigorously train the user in its operation. That's the best way to achieve safety, IMO.