Anger cannot be overcome by anger. If someone is angry with you, and you show anger in return, the result is a disaster. On the other hand, if you control your anger and show its opposite - love, compassion, tolerance and patience - not only will you remain peaceful, but the other person's anger will also diminish.
Even more important than the warmth and affection we receive, is the warmth and affection we give. It is by giving warmth and affection, by having a genuine sense of concern for others, in other words through compassion, that we gain the conditions for genuine happiness. More important than being loved, therefore, is to love.
If pity was always equally alive and acting in all individuals and in all circumstances, we could do away with moral. Unfortunately, it is not compassion, but rather it's contrary, selfishness, that act most strongly in us.
I think there is a complicated side effect to overcoming evil in that we are forever changed by it. I think after we ingest some of the cruelty of the world, it takes years off of our lives, but it also gives us wisdom and a little grace, hopefully a sense of compassion.
In harmony with the Tao, the sky is clear and spacious, the earth is solid and full, all creature flourish together, content with the way they are, endlessly repeating themselves, endlessly renewed. When man interferes with the Tao, the sky becomes filthy, the earth becomes depleted, the equilibrium crumbles, creatures become extinct. The Master views the parts with compassion, because he understands the whole. His constant practice is humility. He doesn't glitter like a jewel but lets himself be shaped by the Tao, as rugged and common as stone.
There is a common perception that compassion is, if not actually an impediment, at least irrelevant to professional life. Personally, I would argue that not only is it relevant, but that when compassion is lacking, our activities are in danger of becoming destructive. This is because when we ignore the question of the impact our actions have on others' well-being, inevitably we end up hurting them.