This is just My Opinion...
Of Course, There are MANY Reasons for this Refusal.
Lack of Empathy. Some People don't care about things that don't Affect them Directly.
I believe that for Many People, Acknowledging Racism is like Grabbing that one thread on a Knitted Sweater.
Once you Pull that thread...
They would have to admit, they were lied to by their Parents, Teachers, Friends...
They would have to reevaluate their past, their actions.
"If you haven't Lived it, You Just Don't Get it."
& that is True.
BUT, you can Learn by Listening & I mean REALLY Listening.
It's Horrible. It's Painful. It's Haunting. It was Here and it is Here Now, IT IS REAL,
And It's Happening NOW.