Why?

I witness injustices often now. How come when we learned about the thirteenth ammendment they just "forgot" to mention how it turned the prison system into slavery? Or why are there so many more Native Americans and African Americans in jail than white people, even though white people make up most of the population? Why do we never talk about racism in our classroom? Or politics? Are these not important pieces in becoming a citizen? Why are we told that when we are bullied we should ignore, walk away, tell them to stop, and tell an adult, when the school does nothing? Why do BLM protesters get tear gassed and harmed during peaceful protests, while violent pro trump rioters are just let free? Why? I ask, but no one ever answers.