I'll guess ethnicity may play a role.
In 2010, Lubbock was 45% non-white, including almost 9% Black.
I would bet it’s even more non-white by now. They’ve had a few very grisly deaths over the years, too. Don’t ask me to name them. I couldn’t begin to remember them. I just remember reading about them.
Aren’t a lot of these cities also university towns and all that entails?
Lack of paleface population seems to be a factor in more than one city on this list. Or concentration of certain demographics whom it is not polite to mention.