This is why Reddit style voting is super useful. Twitter suffers from a noise problem as a side-effect of focusing so much on newness and sorting by date (I know they've made recent changes here).

This community driven ranking seems like the best solution to low quality bots posting. A modding driven centralized editing process comes with plenty of issues, as we've seen on Reddit. And yes Bot's provide plenty of value, far outweighing some niche political accounts making the rounds.