I was referring to something along the lines of the attacker would occasionally orphan a block they don't like or refuse to confirm transactions that don't meet certain criteria.
I think that's quite a stretch to say that miners will support deliberate censorship and undermine the foundation that Bitcoin is built on. The last time Ghash exceeded 51% threshold, the price dipped briefly and there was a huge discussion about the whole fiasco. If that's was the consequence of them having 51% of the network without doing anything malicious, I would think that miners that care about their own returns would take more proactive steps to prevent this from becoming a threat.
If the pool is able to offer more than what other pools (even those with very low/no fees), then I would think there is some motives behind it as well.