Don't lose control of yourself because others lose their

Check whether or not you could ever completely subdue your enemies. You will [find that you would] never run out of enemies or subdue them all before the time came when there were no sentient beings left. But if you subdue your anger you will not have a single enemy, and it will be the same as subduing all your enemies.

There are reasons why it is not right to get angry with someone who does you harm. Suppose a man hits you on the head with a club. Think as follows to stop yourself becoming angry: “If I must be angry with the thing that actually causes the pain, I should be angry with the club. But the club itself is powerless, it is being used.” The man hitting you is powerless, too. He is being forced to do this by the delusions in his mindstream. He had lose control of himself and turned into a “devil” temporarily. He is “being used” by the “devil in him”. It gain you no benefit but produce negative effect by losing yourself too and summoning the “devil” in you to be angry with them. So it is wrong to be angry, it is silly to be angry, it is useless to be angry.

How could I find enough leather
To cover the earth?
Having leather on the soles of your sandals
Is the same as covering the whole earth.

~ Shantideva (Engaging in the Deeds of Bodhisattvas)