Christians who treat people who hate them with sweetness are exactly the problem.

Again, coming at this from my anti-theist bent; but it's pretty clear you don't treat people who are attacking you sweetness and honey. If a mongol is burning your church, you pick up a god damned weapon.

As far as I understand it, the reason you "love your enemies" is only such that you basically carry your responsibility that God bestows upon you to "love" all of God's children. And by love, we mean a moral responsibility to do good actions that will benefit everyone. You love your kid, but if he points a loaded gun at his sister, you are not going to kiss him. Even if it's an accident, you tackle that sumbitch because you love your son. You want what's best for him even if that hurts him in the immediate moment.

Frankly, this kind of love is the kind of love a Medic or Corpsman has for his soldiers or marines. The kind of love that will break bones and due unspeakable pain to you, in order to save your life. You love your enemies in a way where you understand your obligation to God to help save them... that does not mean you kill yourself with kindness that will not be repaid.