So the author of the study clearly states that institutional racism exists, then with this preconception asks a sample of black people if they "feel" racism exists. When they say yes, it reinforces the author's belief. 
At least see what percentage of other racial groups have been stopped by the police, mistaken for a worker, or felt outraged about their treatment. Give us a comparison. Show the hard numbers. Just "feeling" repressed doesn't make it so.
https://www.youtube.com/watch?v=ZtYU87QNjPw