Wasting and abusing life is your opinion, not an objective fact. It was the primary motivation behind the idea of eugenics.
Should low-IQ people be not allowed to have children?
Should poor people be not allowed to have children?
Should rich people who have reprehensible belief systems be not allowed to have children?
Do you see how quickly this becomes a problem?
Did it also occur to you there are people who wanted children and then regret it, as well as people who didn't want children and now don't regret it?