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.
It may not be a single pool that is controlled by the same entity. It could be 5 pools that are controlled by a single entity (secretly), that always end up on the correct chain when a block gets orphaned. If the pools are paying out actual earnings, those that have a higher block orphan rate will end up paying out less.