These people are monsters.
The American left has long fought against Judeo-Christian morality wherever they could find it. And whenever the informal 'morality based' institutions of our civil society have been replaced with more government, they let out a little cheer. They have also fought long and hard to see the state of Israel eliminated because they view it as a declaration of the west's moral self confidence over other belief systems.
But I have I have to believe that this represents one of those 'be careful what you wish for' moments for them. I can't imagine that even the worst creatures of the American left think it's OK to kill children in their sleep.