Mafia 48. Club of the Almighty

it's just not yet clear why inactive players, who ended up in that role by chance, are being targeted as villains.

It just so happened that along with inactivity, your behavior was also clearly negative. Although, until Millicent proved her peaceful nature at the end of the previous day, I considered her and Revan to be negative players, but after a near-reveal at the end of the day, my mistake became clear.
And even the most inactive and peaceful player will still respond to direct accusations. In your case, it became clear that you no longer believe in victory and have given up on the game, which is a good thing.