It's always someone, whom out of envy, hatred, greed, or just delusions of grandeur, will summarily place others at the bottom of the pecking order, classified as less than human.
We have lowered that bar enough to take in human offspring, those we naturally should be most inclined to protect.
As long as humans delude themselves that other humans are less than human, the slaughter will continue. Whether on roadsides, on fields of battle, or in clinics, blood will be let to satisfy those who feed off the lives of others, justified because they are seen as lesser beings.
All else is spilled in trying to stop that.