People may argue a majority of ten year olds are incapable of making such judgements. I will argue that such people are not giving children a chance. Further, a majority of the adults are also incapable of making this decision. There is no rhyme or reason to continue to insist that adults are somehow more capable of making ethical judgements. Adults form the government.
Adults pass laws.
They pass laws that advance their own agendas. In the name of protecting the children, Draconian laws are passed that serve to prohibit what adults find offensive to themselves. Adults don't care about what the children want. They care about what they want. Because the adults are unwilling to go without it.