The Water sign's fault is being untruthful. They will suppress the truth by words, writing and conduct to do damage to another. This is not spite. This is their non-violent way of getting their revenge. Milder cases include stretching the truth a little, not exactly untrue but not the real truth.
Water signs are emotional people and tend to get carried away in the heat of a situation.
These people are not prone to physical violence normally, but being of an emotional nature and having the tendency to let things build up inside them, they can become extremely abusive. The exception is the sign Scorpio. They will resort to caustic verbal and often times physical violence in an instant. Scorpio, by ancient definition, was previously ruled by Mars as is Aries, and that Mars quality in present in both, both are prone to physical violence when angered. As you can see, just from the knowledge of the elemental sign of an individual you can get a good idea of his virtues, evils, nature, and emotions.