The old gay porn to kids : plastic gun comparison is to show that there are times when it is justifiable to restrict someone's constitutional rights, even if they are mentally capable, over 18, and have never committed a crime in their life. You're essentially holding a double standard; it's ok to sometimes restrict 1A rights, but it's never ok to restrict 2A rights. I'm pointing out that you should rethink your stance from an objective view point.
There is a HUGE difference in those two situations. One is infringing on someone else's safety (showing gay porn to children). Merely possessing a plastic gun doesn't hurt anyone. The comparison should be:
Possessing gay porn vs possessing plastic gun
and
Showing said porn to children vs carrying plastic gun through security
Are YOU saying we should restrict 1A rights to possess explicit material in our own home? After all, it's all right to restrict 2A even if it doesn't affect others, right?