Why on earth is it? Your god is on record as being more than willing to indulge in a little genocide & infanticide from time to time. The amount of times I've seen miscarriages and still births explained away as "God just wanted another angel" on social media makes me wonder why it's okay for God to perform an abortion but not, y'know, the humans who made the foetus in the first place.
Oh dear, there is so much assumption in that post I hardly know where to start.....
First of all, 'my God' has the absolute authority over life and death because he created life and because he alone has the right to end it, and he alone has the power to restore it. That is the difference. Death to God is not a permanent state.
The times when a great loss of life occurred, it was his prerogative to act in any way he saw fit under the circumstances. He does not have to answer to you or I about any of his own choices or actions. No life lost is gone forever and death leads only to a peaceful sleep....not to any heavenly bliss or eternal fiery hell. There is no immortal soul and a restoration of life is accomplished by resurrection.
Those who explain miscarriages as "God just wanted another angel" sicken me as much as it does you. God does not perform abortions, humans do that. Miscarriages occur generally because of some fault with the genetics of the fetus or with the functioning of the mother's body, either physically or chemically. Many take place that women are not even aware of.
And I'm asking ironically because I know that any attempt at justification will simply boil down to 'because he's God' so basically you've got no real explanation.
Who or what do you think God is? I can assure you that he not in any way related to the god that Christendom serves.