2010 BP Oil Spill -- Oil Eating Microbes Can Clean Spill

There is a way to clean up this spill that has been proven to work, why is it that BP and the Government are not using these Microbes but instead deadly chemicals. Probably the same reason BP decided to circulate out the Mud and replace it with the much lighter Salt Water that was a factor in the explosion, even though the owners of the Rig did not want to.
The answer is easy[One Word] : Arrogance...