The fact that people want and look for this sort of thing encourages the creation of it. Name one instance where an active demand for and consumption/use of a product didn't result someone attempting to profit off of it. Hell, isn't part of the argument for pirating that exposure is good for an artist even if they don't necessarily make money off of your download?
If you're look for, downloading, and/or buying actual kiddie porn then you're supporting the market for it.
You are correct in almost every instance...except this one.
We should all know that the laws of supply and demand run the capitalist economy that the world is in at the moment. People think diamonds are cool, there aren't a lot of them, price is high. People want some good food, price is high. People are horny, people make porn and sell it.
The difference with Child Porn is that A) it is often traded, not sold and B) the laws of supply and demand don't work with it. No one goes "Hey, I'm going to rape my kid for a quick buck." Those that decide to sell the stuff are most likely the ones creating it for their own pleasure.
And Blob...
Children are not getting corrupted...they got corrupted. What's done is done, and I see no reason in not letting the shit that is out there stay out there. There have been studies that show that the use of child pornography (and pornography in general) actually lowers sexual abuse. People feel like they can enact their fantasies through the stuff so they don't do it in real life. Like I said, I agree that making the stuff is bad, but if letting people who might possibly harm children have access to the stuff that will dampen their desires, I'm all for that.
Regarding artwork...Nevermind by Nirvana comes to mind...picture wise. Not to mention a metric fuck ton of paintings.