A black woman finds an injured white man laying on the ground and takes him home and nurses him back to health.
After a couple of weeks, he rapes her, kills her family, and steals everything she has. She is shocked and asks how he could do such a thing after everything she had done for him.
He answers: "Stupid BITCH, you knew I was a white man."
Realize who you are dealing with and stop asking "why" and "how could they". Until then, you are bound for more of the same you have endured for hundreds of years.