Han wrote:

So what do you propose to do about them?

We are paying the FBI to prevent terrorism, and we have monitors
exmining websites. People who openly advertise that they are crazy
(as von Brunn did on his website) should not be allowed to possess
firearms. In addition, I am afraid that airport-type controls should
be instituted at places like the Holocaust museum(s). The ubiquitous
presence of firearms permits too many crazies to go around killing
people. If you don't want to limit firearms possession, we'll all
have to live in an armed defensive camp.

They may be crazy, but they're not stupid. If you go around taking weapons
away from people who act crazy in public, they'll simply stop being public
about their business. You will, therefore, accomplish nothing.

Meanwhile, you've deprived someone who fears alien abduction, and its
resultant anal probing, the ability to defend himself.