As a PvPer, the attitudes of a lot of PvPers here make me cringe.
All you have to do to not be killed by me, is not wear a federation power play tag.
That said, powerplay objectives should not be able to be accomplished in private groups or solo. Even if it's a PvE activity like hauling, undermining, or conflict zones. In the context of powerplay it is a strategic PvP activity taken against other player groups and shouldn't be able to be done without the possibility of being opposed.
I am not a PvP player at all. Basically PVE and fairly hardcore into BGS manipulation. That said, I still agree that BGS manipulation and Powerplay should only be done in Open. One big problem with that though, is the structure of the game and the limits it poses to multiplayer play (instancing).