I don't think Qwerty was Mafia.

I think Psy lied about his plans to make us think that. Here's how I think that night would have gone if Psy wasn't lynched.

Laddy investigates Qwerty and gets Scum. Laddy proceeds to say that, and Psy claims Townie.

Qwert gets lynched and flips townie, Laddy now things he's paranoid/insane. Neither get lynched. Psy is now assumed legit cop.

Next day, Laddy investigates self, gets innocent, calls out Psy.

Laddy gets lynched under suspicion of being Mafia and turns cop.

Laddy, Qwerty, and two other townies will have died by this point.

Psy gets lynched. One Mafia remains. Another town gets lynched.

5 townies will have died before the third mafia member was looked for.

Though with Psy's lynch, that didn't happen.

Thats my 2 cents anyway.