Abstain. For one: Let everyone for themselves decide what they want to see or what they don't want to see. We're grown-up and don't need to tell other people what they should not or are not supposed to see.
(Just today there is a the_donald community sprouting on our instance. Should we allow that but defederate others?)
But the actual reason: let's first agree on guidelines when to defederate and then measure them against these.
Doubtful, given that it is much more sustainable replacing cogs and chain wheels only than to also replace the motor...