I definitely wouldn't want to look suspicious. This might come of as a turnoff for innocent people wanting to use mixers. 
Because only a criminal would want some privacy.I get what you mean. But what I was trying to say is that non-criminals would probably stay away from mixers because of the fear of being suspicious to the feds or whatever government entity. Anyway, maybe I'm just overly paranoid and overthinking stuff
.Non criminals staying away based on your position will give credence to the misconception that mixing services is meant for criminals alone but that will be wrong even if I not been a criminal but value my privacy uses mixing services even if feds comes after me, they would probably do some investigation into my activities before coming at me and if they found nothing incriminating will they still go ahead and also I have not read anywhere that its illegal to send my coins to a mixing service.