If you believe in them, you know that they contain the mechanism for changing them. And you accept the changes that have been applied through that process. You don't pine for halcyon days when they were pure (or at least not if you're as fond of freedom of speech as I am). Fer cryin' out loud, the thing was amended ten times in four years after first passage! Then there was that whole Prohibition-of-demon-alcohol nonsense. You can even propose your own. Why not? Oh, wait, I see that you are.
Wow. That's pretty disingenuous.