A downvote should cost as much as an upvote, IMO,

I agree. I would like to see Hive return to that model; however, based on feedback I've received from those with large HIVE stakes, the chance of that happening is about zero. It seems to be a sacred cow to them.

The answer, imho, is strong tribes with strong tokenomics (like POB) that can operate 'on their own' and with their own rules.

People who love their DVs can join pro-DV tribes; people who think DVs should be reserved for illegal and objectively wrong behavior can join tribes that espouse those views.