That could apply to all of the performers, not just Slingblade. The difference is the others (with the notable exception of Mikalah) seem to have a basic grasp of good manners.
There's also a good chance that the others had decent loving parents that didn't put them down all their lives. It does make a difference.
By the way, an you give the links to the websites that are trashing Carrie, I'd like to check them out, just for the heck of it, see what they have to say.