Alright well this is what I know from being Mafia far too much
There is
always one mafian member who posts as little as possible, sometimes not at all, just hoping to glide their way through (Auron, Hsu, Ditto). So, voting an inactive off usually gives you a chance at finding a mafian.
Now, right now our list is too big, but give it time and we'll probably nail it down to a 2-4 list of inactives. This is why I lean toward one. Our main problem with choosing one, is we run the risk of either discovering nothing (because the person doesn't show up to defend themselves, turns up town, and the night kill gives us nothing.).