I'm not sure how simply featuring magic in cartoons is supposed to lead children into the occult, but would please source that one? It seems a little off to me, and Google isn't giving me anything.
It depends on what kind of magic. It can influence people the same way science-fiction inspire some people to have careers in science. I don't recall the source, but it seems that about 30% of the people in NASA admitted to be there inspired by Star Trek alone. That despite the very poor quality of the science of show.
Likewise, magic and occult-themed works do inspire some people to become pagans, neo-pagans, and all sorts of neo-magick practioners. They know the magic in the cartoons and comics is not the "real" stuff, just like scientists know Start Trek is not the real stuff. But at least some are inspired byt it.
I am very against about the "omnipotent" capacity of art making people's mind, but I'm equally against the stand that it does not influence at all. It obviously does in science - as mentioned, it obviously does in history, in sports, in martial arts (how many started kung fu classes because of Bruce Lee alone?), even in mathematics. Why wouldn't it regarding the occult and pagan religions?