When M. Gandhi or Dr. King spoke of civil disobedience, they were greatly aware of the consequences of “an eye for an eye.” It does make the whole world go blind, but not just literally.
There’s a well known experiment in which monkeys in a cell were given electric shocks each time one of them tried to climb a ladder for a banana. This eventually conditioned the monkeys to prevent (even resort to fighting) anyone else who would climb the ladder. One by one however, each monkey was replaced with a new one; until the entire lot was of new monkeys. The electric shock was removed as soon as the first one was replaced, but the memory was already conditioned into reactionary behavior. So now, when one of the monkeys climbed for the banana, even though the electric shock was removed, the monkeys would fight out of reaction instead of reason.
Everyone was fighting and the reason was long forgotten. If we keep seeking revenge long enough, or fight with ourselves for a long enough time, we often become blind to the reason we started in the first place. An eye an eye, but why was the first one taken? Most of the time, the thing we believe taken from us is often still within our possession.