The question is..."Why not?"
Assuming that you are a parent, if your child is in danger of dying...be eternally lost....what would you do? Would you sacrifice all of yourself to save your child? I know I would.
This is a general reason but there are many scriptural reasons as to why God did what He did. It's the greatest act of love and I am very thankful for it.
If you want scriptural reasons, we will be more than happy to share them with you.
In His Name,
Eddie