As the coinjoin coordinator, you are not the arbiter of whether or not SBF is allowed to use Bitcoin, you are the arbiter of whether or not you turn his stolen coins private. I'm asking you why you would choose to help Sam hide the stolen money from his victims.
Why would you choose to help the opposition party in some dictatorship to spend their donated funds anonymously if you know that the dictator of this dictatorship considers their actions criminal? Are you against the law or what? Or do you just think you have a moral right to decide which criminals deserve punishment and which do not? Why do you even have to decide when the only right thing to do in this situation is just to be a provider of CoinJoin services regardless of your personal feelings and moral principles? Of course, you want to be an arbiter because it helps protect your income, moral principles only get in the way of making nice buck.
This is completely contradictory: If the coordinator had no moral principles and just wanted to "make a nice buck", then they would collect a share of Sam's stolen funds and make his coins private despite any suffering that was inflicting on his victims. Moral principles is exactly what prevents a coordinator from helping Sam.