Your argument is that we should wait for a tragedy to make rules to prevent a tragedy.
No, my argument is that telling a 13 year old girl that she has to have her name in a public-facing federal database in order to fly a 9-ounce pink plastic RC copter from a mall kiosk, or face a $20,000 fine will do exactly NOTHING to prevent a bad guy from doing all of the horrible murderous things that we're seeing done with RC toys. Oh, right - there are literally millions of them in the hands of people, with untold millions of flight hours on them, and we're not actually seeing any of that. But you're pretty sure that someone looking to do harm will step up and register their name with the feds, and then write their identifying information on the RC airplane they're going to use to deliberately hurt people? Are you really thinking this through?