The "legitimate reason" you provided was that "Viva's reasoning seems sound", and the other reason that "Mortician is a village-sided role" doesn't hold much water either. I'm pretty sure Crestham didn't change every single villager/mafia role around just so people wouldn't get confused. The Mafia side lacks a Mortician, so it's completely reasonable that he just switched a Mortician over since there really isn't any other way you can say "Mortician".
And Viva's reasoning is not entirely sound either. Never have any investigation results shown in this entire game. Does that mean that the cops are all inactive? I highly doubt it. If they were then *facepalm* though.
Plus, I'm not saying that you two are suspicious because you voted for BlueDarkness. I'm saying that you two voting BlueDarkness so as to prevent the lynch from swinging onto the Geoff side is suspicious. Why, is Geoff some kind of god that he has to survive?
Still, I won't discount the possibiltiy (and right now probability) that you two just voted for BlueDarkness because Viva's reasoning sounds reliable. It seems that we have some sort of target for today, so I'll just let it slide for now. But I'm watching you two.