There's also another great saying: An eye for an eye leaves the whole world blind. The bible also says many other contradictory things like turn the other cheek, love your neighbor and so on.
You seem to want to remain without understanding. There is no contradiction in the Bible.
Eye-for-eye is the job of the government, to retain peace and justice among the people. Go back and read. It is stated in the context of government.
Turn-the-other-cheek is an exhortation to put up with a bit of pain from another, rather than to start a big fight.
"Love your neighbor as yourself," is simply to recognize that other people feel about themselves as you feel about yourself... because we are all people. Even the crook or murderer wants love for himself. Peace in love... or do you want strife and fighting?
