Are you blind?
Until recently America had child labor and would lynch black people. A FEDERAL judge in my hometown of New Orleans is famous for saying "We like to try our niggers before we hang them".
Human nature is human nature.
We live in a 'veneer' of civilization.
Underneath are still the same old animal instincts honed over millions of years of evolution.
Don't ever forget that. Or forget it at your peril.