> underage sexual drawings...Art is not a crime
Pornography is not art.
I don't wish to get philosophical about this.
> Nobody is being harmed or exploited by creating such works
This is true but it's not an valid argument in any court.
Victimless or self-victimizing crimes are commonplace in legal codes around the world and there is little chance of them being entirely abolished. Especially where public support exists for such laws.
> the same tactics will eventually be applied to anything deemed potentially offensive to someone.
Any measure of power granted to any man will be abused. That's life.
Censorship is not the demon it's made out to be.
Most of us are in favour of censoring or punishing slander/libel, death threats, public obscenity (to widely varying degrees), malicious pranks, invasive marketing, and 150dB music at 3:00AM.