Most of these are not cartoons. A sicko could take a picture of your child at a public swimming pool, go home to his computer and change the photo enough that it would be considered computer generated and your child could be depicted in a sexual act with an adult.
With software programs like Electric Image Animation you can create realistic 3-D human bodies with blank faces and take anyone's face and map it to the body. This body could be doing anything.
How do you think tabloids get a three-breasted woman pictured on the front. She certainly did not look like a cartoon!
So imagine finding out your child is on a porn site and there's nothing you can do about under the current ruling because the picture was altered by a computer.
Obviously you haven't read the ruling, because the part of the act that made such things a crime was never challenged. That was illegal before this ruling, it's still illegal after this ruling, and if you'd bothered to actually read the thing instead of shooting your mouth off, you'd know that. But hey, why let some inconvenient facts get in the way of a nice diatribe?