What if downvoting/flagging was reserved for a certain type of group, similar to Witnesses? We could vote in our own community-police, who have the 'monopoly on downvoting' and are charged with keeping the community respectable.

This would be very similar to how governments have a monopoly on violence in our current societies, which I feel does not conflict with DPoS which is also very similar to our current political systems (represented democracy).

For longevity and objectivity, the 'community police' should be a different group than the Witnesses.

As such, when flagging powers are being abused, we can vote to take away those powers from those who abuse it and vote into power more honest people.

This makes more sense to me than flaggingpower based on financial prowess, as the current system is. We can't stop flagging done by people with more money unless we can accumulate more than them. If the powerful people are corrupted, we are thus powerless to stop them. But a voted-in group can also be voted out, regardless of their SP.