Beyond the concerns you raise, vote caps etc., inhibit problematic behaviors mechanistically rather than via better social structures. Limiting the number of posts a person can make per day is one way of addressing potential flame wars when the underlying problem is that flaming is deemed acceptable behavior [and consequently such sites attracts people who engage in flaming and encourage some people to post in ways that get all their digs in at once].

The alternative of building community norms is harder. Mechanism can support it, but success depends on the over-arching social structure.