They are just human. Not an alien, a dragoon, a fairy or a man-who-has-a-superpower. 

They do have a limited time of their own life like normal people do; and they just chose their choices for their life to do what they wanna do or have to do as a human should.

What did they do wrong?

I don't think they did anything wrong.

Those were their choices to choose. And they just chose. So I'm gonna do what I wanna do. And what I wanna do is supporting them as long as I can.

All of 12.