> If everyone would follow this rule, the crazies would be left alone shouting into the emptiness.
On the other hand, unless that's society consensus, you'll just have the crazies screaming, the media picking it up and amplifying it and the politicians acting on it.
Unless we vote on everything in person (or commit to not changing policy), not publicly disagreeing with something is a problem.
I've had this happen (accidentally, there wasn't any malicious intent, I believe) in a community I'm part of. Some people felt that a certain policy was unfair, so they petitioned for its removal. I (and apparently most others) hadn't bothered paying attention to the "Feature Request" forum for policies, so nobody spoke up to point out the side effects of the intended change. The change went through, we suffered the fallout. The side effects weren't "omg the community is broken now" large, otherwise the change would surely have been reverted, but they were significant enough that you could measure it.
That's my main issue with the whole public debate thing. You can either tune out and fatalistically accept whatever happens, or you can tune in and try to stop what you consider to be detrimental. There's no "hey, this works, let's just keep it working, and not spend so much energy on how it could be changed" position. I usually choose fatalism these days because my energy is limited, but of course that means that those who choose to invest their energy into politics instead of contribution are in charge, and I'm not so sure they're the people we want to be in charge.