From what I remember, the child pon drawing law was about people taking child pon photography, and running it through a Photoshop filter to make it look like a drawing. That way people were trying to get around the law. Also, it was trivial to return the 'drawing' back into a photo by reversing the filter.
This argument might have worked, up until the point when they criminalized cartoon child pornography.
You will perhaps agree that encryption has the potential to directly harm people just as physics or chemistry?
No.