[But to reply to your metaphor: I certainly hope you're not intending to compare Microsoft software favorably to Wikipedia contributions. I'd rather, if we were to use this analogy, strive for something like Linux, BSD, or OS X where massive gaping security flaws aren't inherent in the system.]
Massive gaping security flaws aren't inherent in Wikipedia in regards to preventing vandalism? That's news to me.
It's not a bug, it's a feature!
Oh, I agree that it's a necessary trade-off, but it's still what it is.