How does one define it?
What makes us human?
Is it the best of us, or the worst of us?
Even the scientific community has had major disagreements over the concept. Is it a species? Or a genus? Or a sub-species?
For several centuries, the “best and brightest” of the time believed that certain ethnic groups to be superior to others, a belief that justified the array of atrocities committed at the time.
In fact, the entirety of human history is a history of humans committing horrendous atrocities on anyone that seemed even slightly different, be it their clothes, language, skin, hair, eyes, beliefs, handedness, whatever it may be.
The history of humanity is a history of fear and hate.
Humanity lacks humanity.