Oh, so if I stab your sister in front of you, try to kill you myself, then reveal everything you've ever known is a lie, you wouldn't want revenge? You wouldn't come back at me, and instead smile and give me a pat on the back?

You are a human. I know exactly what you would do. You'd find some form of retribution like everyone else.

Which is why Delita is the prime example of humanity in FFT. He displays what every human does in their weakest moment, they break down, they fall apart, then they find a grain of hope to grasp, and use that to fuel their desires.