Sure I could have. I could have also made a Mafia or a Serial role that investigates as Innocent, and do away with the whole investigating Guilty thing entirely. For the record, my character of choice can legitimately interact with and manipulate reality, including swapping their appearance with others, so it's not like it would be a stretch from a flavour perspective either.
I'm not saying my claiming Miller has to mean I'm Town in your eyes. I mean, I wouldn't fake claim Miller as Scum, because it would burn me for any game I play here in the future if I happen to roll Miller, but you only have my word (and my history of having never fake claimed Miller, I suppose) to support that. I'm saying that my Miller claim makes sense from the character I'm claiming, and that as a Miller, claiming as early as possible was the only option I had. I'm really not following what exactly is suspicious about me playing Miller... exactly how I should be playing Miller. By all means, if you believe I should have approached this differently, do tell me.