Well that’s all fine and good, however the Bible says we are all sinners who have fallen short of the Glory of God, so we might aspire to the standards established by, and taught by Jesus, but nobody is going to actually achieve them.
My late Grandfather said to “turn the other cheek” too, but he also said “you’ve only got four cheeks to turn, and after you’ve turned all of them, grab the sonuvabitch by the neck and kick his ass!”
A basic Lutheran doctrine, which is in general a basic Christian doctrine, is that the purpose of the Law is as a tutor, to demonstrate to humans our inability to, as Jesus put it at the end of Matthew 5, be perfect as our Father in Heaven is perfect.
Putting Trump's religious proclivities aside--and I am not prepared to judge his salvation, that is between Trump and the Lord--anyone in general who states that his/her favorite Bible verse is "an eye for an eye" demonstrates at best a beginner's understanding of the Bible, since the overarching message of the Bible is chesed or agape, self-sacrificing love: Jesus sacrificed Himself for us, and we who accept His saving sacrifice are commanded to sacrifice ourselves for others (John 13:34-35). It would be a step up from, say, Psalm 137:9, "Happy is the one who takes [the enemy's] babies and smashes them against the rocks!", but certainly not a verse that would be the first to be chosen as exemplary of a Christian thought process.