But that would taken away from the message of the episode, the point that racism is never a permanently "solved" problem but is something that will always have to be fought, even in the far future. If you look at the white nationalist groups committing open terrorism in the US today, and at the like-minded media pundits and politicians and shock jocks, the thing that unites them is a desire to undo all the progress of the civil rights movement, to turn things back to the 1950s or even the 1850s. There are still people who want black people to be enslaved, still people who want Jews to be exterminated. Their overriding drive is to go backward, to undo progress -- to turn back time. Krasko and his racist motivation to do just that was absolutely vital to the story, because he represents something real and actively dangerous, something that's erupted into open terrorism in the US multiple times this week alone. So removing him or having him just change things by accident would've massively undermined the statement this episode was making.
