If no one listens to you, but lots of people listen to you when you put a certain hat on, and you feel the subject is an ethical imperative for you, then speak

If no one listens to you, but lots of people listen to you when you put a certain hat on, and you feel the subject is an ethical imperative for you, then speak your mind, I say. Be prepared to deal with the consequences of course, which may include derision, abandonment, cynicism, or apathy.