How are we expected to live out "turn the other cheek" and "love your enemies" in today's circumstances?

Are we really expected to give in to our enemies all the time? Chris Chong thinks that the verse should not be taken literally, that Christ did not call us to always let ourselves be beaten by our enemies.

But i think Christ did. So does this mean that Christians cannot fight war? War involves killing your enemies, not loving.

Nowadays how can I find someone who truly can live Christ's commands? But does this mean that we give up trying? As the song "I have decided to follow Jesus" goes:

"Though none go with me, I still will follow."