These scare threads are stupid. "HURR DURR POOL HAS 51% OF MINING POWR" What are they going to do? It's not like miners will continue to support that 51% after an attack. The pool would be finished. There is no incentive whatsoever for a pool such as GHash.io to attack the Bitcoin network.
Dude, do you know who runs ghash.io and who owns it?
Check that out and come back later.