I assume you mean 30% of all molested children. Meaning, of course, that 70% of all children are molested by heterosexuals. Therefore to have the largest impact on preventing child molestation, heterosexuals should be exterminated. Do the math.
You remind me of a guy who used to go around suggesting that the Earth would be a better place if 80% of the human race simply vanished.
No one took him seriously either.