This is all because of Marge Simpson's crusade against cartoon violence ...
Truthfully though, some children (in particular 'hyper' young boys) have difficulty with cartoon violence because it makes them act out in similar (often dangerous) ways and parents of those children like to limit their exposure to it. As a rough guestimate, there is probably 1 child and parent like this in every class in every school (which adds up to a lot of parents and children)







