First time posting, so forgive me if I'm not exactly doing this right but going off of what foolwriter said in terms of Harris vs. Deebs, I think they also serve to show that crime doesn't pay, but if you follow the rules you will be rewarded. Harris is a soldier who went off to fight for his country and while he escaped the horrors of the war, he found civilian life was just as brutal. I think this is why he chose to stay in Cool World, there pain and death aren't permanent. He meets and falls in love with a doodle, but despite potentially decades of sexual tension, follows the rules and only goes as far as the rules allow. In the end he is rewarded and his death allows him to fully be with the woman he loves. Deeb is a murderer, who despite several warnings, breaks the rules. In the end he ends up with a woman who hates him.
One thing I don't understand is that if Holliwood wanted to be a noid so badly, when she removed the spike and everything started turning into Cool World, why didn't she try to stick that sucker back herself? Just figured if we're all doodles that's cool too?