There is room to be argued both ways about whether or not we need better controls on mentally unstable people. I won't take a side on it.
The problem is any new regulation at the federal level on private sales, or on magazines and cosmetic parts. Not only will it not work, it will piss people off and yet again make a huge paradigm shift, again letting the republicans take over, continuing the vicious cycle of political stupidity across the country.
When I was younger it would have bothered me more. Now that Arizona and all those other states have voided most federal gun laws, it has become particularly difficult for me to take this junk seriously. It is funny though, just how oblivious every news agency seems to be to the firearms freedom acts when reporting on the Tucson shooting and attempts at gun grabbing that could come as a response.