The Hawk, the Kite, and the Pigeons

The Pigeons, terrified by the appearance of a Kite, called upon the Hawk to defend them.He at once consented.When they had admitted him into the cote（圈内）, they found that he made more havoc（灾害） and slew a larger number of them in one day than the Kite could pounce（攻击） upon in a whole year.
    Avoid a remedy that is worse than the disease.

（from Aesop's Fables）