Interesting because I was recently listening to a thought provoking philosopher's take on this specific subject.

If I have understood the argument correctly, he states that "turning the other cheek" is a way of avoiding unnecessary escalation in a conflict, since, as the interpretation goes, finding "the right measure" can be tricky/difficult (there are so many ways we can misjudge the situation, the intentions of the aggressor, or the degree of the offence committed). "An eye for an eye" is only necessary when there is no doubt about the intention and the degree of the offence committed.

Thought it was interesting, and wanted to share...