Every time I'm reminded NuTrek exists I get sad about what we've lost.

Thus revealing what kind of people they were at the time.

Humans do the same thing to humans all the time.

We've banned and made efforts to eradicate: children out of wedlock, children who turn out gay, disabled children, jewish children, children who aren't "aryan", more than two children to a single family...muslims, christians, uyghurs, indigenous groups all over the planet, mongols...

And it's not at all a thing of the past as in just the last 50 years we've had ~15 attempts at the exterminations of targetted groups of people.