Hatred blinds your ability to make a right judgment

I heard this somewhere in the Hae-shin (Sea God) movie. I feel this is very true. That's why we need to love our enemy, because if we keep hatred, you cannot see the truth and you will go the wrong way.
Of course it is not easy not to hate someone who knowingly cheats someone with a wrong reason and someone who is close to you receives the consequence. However, we need to figure out the way how to still not to hate that person. If God allowed that to happen, then we need to find out what kind of intention is behind it, what we should learn from it, and what kind of good change we can make out of it, etc. We need to even challenge God to find out what he wants to see happening out of this.