Maceman, I have the answer, seriously. It is because "they" are bigger and better armed than "them". "They" being the government and "them" being drug users. The Constitution has nothing to do with it, just as in this stupid ruling. Just who's bigger and better armed.
And don't you forget it. :0
Actually, after much consideration of the subject, I've come to the conclusion that it's not a matter of who is better armed. What it really boils down to more than anything else is who is more willing to use the arms they have. FedGov, and it's various subsidiary StateGovs have no compunction whatsoever against blowing away anyone they percieve as the slightest threat to their authority.
I'm constantly amazed at how seldom people in this country are driven 'postal' by the insanity that has become our government.