The rule of “an eye for an eye” was part of God’s Law given by Moses to ancient Israel and was quoted by Jesus in his Sermon on the Mount. (Matthew 5:​38) It meant that when dealing out justice to wrongdoers, the punishment should fit the crime. a

The rule applied to deliberate injurious acts against another person. Regarding a willful offender, the Mosaic Law stated: “Fracture for fracture, eye for eye, tooth for tooth, the same sort of injury he inflicted should be inflicted on him.”​—Leviticus 24:20.

The real question is Does it apply to Christians? The clear answer is No, this rule is not binding on Christians. It was part of the Mosaic Law, which Jesus’ sacrificial death abolished.​—Romans 10:4.

Even so, the rule provides insight into God’s way of thinking. For example, it shows that God values justice. (Psalm 89:14) It also reveals his standard of justice​—namely, that wrongdoers should be disciplined “to the proper degree.”​—Jeremiah 30:11.

Brutal revenge

Do me I do you

Simply means tit for tat.

Tbh, an eye without an eye carries detrimental consequences to ones self and to this regard,one is not being helpful to others.

There are deterrents measures to crime so as to forestall it's occurrence or prevent reoccurrence.
And to avoid anarchy is the very essence of law.

So an eye for an eye is still very much the way to go but it has to pass through the legal process to achieve what is now known as justice

gideonjeta:
The rule of “an eye for an eye” was part of God’s Law given by Moses to ancient Israel and was quoted by Jesus in his Sermon on the Mount. (Matthew 5:​38) It meant that when dealing out justice to wrongdoers, the punishment should fit the crime. a

The rule applied to deliberate injurious acts against another person. Regarding a willful offender, the Mosaic Law stated: “Fracture for fracture, eye for eye, tooth for tooth, the same sort of injury he inflicted should be inflicted on him.”​—Leviticus 24:20.

The real question is Does it apply to Christians? The clear answer is No, this rule is not binding on Christians. It was part of the Mosaic Law, which Jesus’ sacrificial death abolished.​—Romans 10:4.

Even so, the rule provides insight into God’s way of thinking. For example, it shows that God values justice. (Psalm 89:14) It also reveals his standard of justice​—namely, that wrongdoers should be disciplined “to the proper degree.”​—Jeremiah 30:11.

You are just deceiving yourself. That is the meaning of Just is!

And Christ still restated it "Do unto others what ... " You know the rest!