As awful as this is, we do need to put it in some perspective.
Folks in China have been aborting their girls in favor of boys ever since the one-child-policy started a few decades ago. Chinese parents want a boy (it’s a cultural thing) and so they abort their girls.
The ratio is now about 120 boys born for every 100 girls. That works out to about 3 million missing girls a year. Millions.
Before they had ultrasound to determine the sex before birth, they just killed the girls outright, like the Greeks and Romans. The Chinese still expose girls.