If expressing a 'leftist' view (whatever that is) means being able to abuse other members of the board, then no, you may not express yourself on this board.
PC? If you want to make an intelligent retort to someone, then go for it. If you want to be able to be abusive to others, then get the heck out of here. If that is PC, then so be it. I call it being respectful.
I have no idea what all that political hogwash is.