Once there was a water snake who lived in a pond, which it claimed to be its own. Not far from the pond there lived another snake, a viper, who often went to drink at the pond and said the pond belonged to it only. The water snake challenged the viper and the two snakes decided to settle the matter by fighting a duel.
The frogs supported the viper because they did not like the water snake. They croaked frantically when the two snakes fought the duel. The viper won the battle. Later, the frogs asked the viper for their share in the victory.
The viper began hissing, and when the frogs asked what it was doing, it said, “I am repaying you in the same way, you helped me.”
Moral : Helping an evil character begets no good.