I would think that it would be fairly obvious that trying to assert that down-votes are not for disagreement is extremely futile. It's human nature to react to things they disagree with, and if down-votes don't mean disagree... then what? People aren't allowed to disagree? The only way to disagree is to actually invest significant amounts of your time?

Sounds great in theory. But then a small number of zealots can derail just about every thread with minimal effort. I image it would really degrade a community in a heartbeat. So it's probably a good thing nobody has found a way to enforce such a policy.