Haha. In a way, I understand it.

[Because he's the same way. The world's torn him down, took away his loved ones...and yet here he is, happy with life, and looking to the future.]

For most, things like that would weigh on you, and change you for the worst. But someone like him...despite everything, he puts others before himself. I think he's just a young man who truly loves everything the world has to offer.