I am tired of how routine violence against African-Americans at the hands of white people has been. Angry as a journalist that this has happened so often that we all know the angles that must be covered, questions to be asked, and stories to be written. とはどういう意味ですか?

質問を翻訳

It means he's already tired to see racism over black people because it's already happened so often until he —as a journalist— remembers about the details, like things they shouldn't write, questions they will ask in interviews, and what kind of stories/articles they should write.

hope this'll help!