
It is difficult to understand when someone is taken home at such a young age. It's amazing that he was such a great young man that he completed his work here on earth so quickly. I think that is the best way to look at it too, not with bitterness or anger, though those are understandable and common sentiments.
Each of us has a purpose during our time here. While this young man may have completed his part of it already, for him, I'm sure that those who are left to mourn will continue his legacy. God knows that too.
We all mourn in different ways. When someone of faith mourns, it can be somewhat joyous because we do believe in life after this mortal body stops. To be with God is a far better thing.