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.