Um yes they do. If 51% of miners want anything at all, they can fork everyone else off the blockchain that doesn't use their protocol.
This kind of uneducated nonsense will (hopefully) get you banned for a few days if you'll continue spreading misinformation on this board. If you are not trolling, you will have an incentive to read some good resources that explain Bitcoin's protocol (you can find a lot of quality stuff here:
http://lopp.net/bitcoin.html), and if are trolling, it will be a good riddance.
If I am wrong please explain my error instead of deliberately maliciously threatening me. Please explain why 51% of mining power cannot create a chain fork.