Because children are not the government's property either, and society is not being asked for their opinion, so their will is not relevant. Society does not and

Because children are not the government's property either, and society is not being asked for their opinion, so their will is not relevant. Society does not and will never care about any specific individual. The people who are ultimately responsible for the child (and therefore hold decision making authority) are the ones who caused it to be here. Pretending "society" holds that responsibility just means abdicating it entirely.