This assumes there are no consequences for such parents. Add strong enough consequences (e.g. loss of freedom) to deter others. A "well-meaning but stretched family" is more likely a set of parents who didn't responsibly plan their family. If that's the case the parents should be punished. (In the US, even the poorest parents can be punished for exposing their kids to lead.)
If we make parenting a birthright (as many people support, esp. for the poorest for some reason), mass starvation is the inevitable result.
If we make parenting a birthright (as many people support, esp. for the poorest for some reason), mass starvation is the inevitable result.