Also there are emotions that are aroused by intelligence. For example, compassion can be aroused by pondering people who are suffering. When the compassion is actually experienced, it is true that the mind is somewhat disturbed, but that is more on the surface. Deep down there is a sense of confidence, and so on a deeper level there is no disturbance. A consequence of such compassion, aroused by intelligent reflection, is that the mind becomes calm.
The consequences of anger--especially its long-term effects--are that the mind is disturbed. Typically, when compassion moves from simply being a mental state to behavior, it tends to manifest in ways that are of service to others, whereas when anger goes to the point of enactment it generally, of course, becomes destructive. Even if it doesn't manifest as violence, if you have the capacity to help, you would refrain from helping. That too would be a kind of destructive emotion.
--from Destructive Emotions: How Can We Overcome Them?: A Scientific Dialogue with the Dalai Lama
