LBJ was mean in some ways, but he lacked the vision that Nixon, Reagan, and Biden, possessed. He didn't think big enough!
If we look at the incarceration rate when LBJ was president, and compare it to what happened later, LBJ's performance was truly unimpressive. The incarceration rate actually went down under Johnson! He's practically woke!
What happened after Johnson was an acceleration the likes of which the world has never seen.