Ice...you don't need to be told to go back and read other games as you've played enough of them. The most straightforward mafia vote on day 1 is either one of a) a player who has made a howler and then defends themselves poorly or b) a non-participating player who isn't defending themselves anyway, and indeed who can be explained away on D2 by saying 'well they wern't playing anyway and wern't helping the town' etc etc.
In the absence of howlers...so far...settling on non-participating players for votes is a solid scum tell at this time in the game.
As regards whether the UD rule in this game is of assistance to the town or not - it is clearly of assistance as it will take that bit longer necessarily for the numbers to turn in the mafia's failure.
Your suggestion that the mafia are likely to sit back and do literally nothing might of course be correct. That is not entirely consistent with your voting me who is a) participating and b) not doing nothing but meh so be it.
Otherwise the way I see it, if you (ice) are for instance in the mafia then you are reasonably likely to go kill me early in the game anyway and if you're not mafia, then neither you or I are likely to be long for the game either because they will hit us both just as soon as they can![]()
I suppose that since there are no UDs the mafia would want to get non-participating players out of the way early, but that is assuming those players are still innocent.