Other social media sites have been doing it. Do we want to join in?
EDIT: Some people are saying that this is a power that ought to be left to communities… do we have a specific delineation of powers that relegates these decisions to communities? If not, then I recommend that these users propose such a delineation of powers. I would be very ok with this proposal failing because instead we got a more explicit set of checks and balances.
Instance level action is a last resort option. There is no reason to do anything about X at an instance level. Rules are primarily a community level thing.