Growing balls has noting to do with the healthy upbringing of children, and the effects that graphic images have on the mental health of said children.
Where is Doer when you need someone to scream "SLIPPERY SLOPE" at the top of their lungs?
Adults have the right to choose what they see, kids do not. That's why movie ratings and parental consent exist. You don't have the right to show my, or anyone's kid, imagery that could possibly harm their mental well being, regardless of how much of a hard on you have for the cause.
Present your case to adults, in an adult setting. If your cause is so weak that the only people you can indoctrinate are weak-minded children, you should just give up.