Happiness is not about how much you create compared with how much you might have created under some different circumstances; it is about whether you are solving the problems you actually have.
The purpose of such what-if questions is to justify coercion, but when you ask the same question about an adult, it is shocking, because we all take adults seriously.
If your young children are curious explorers who like taking things apart, find more things for them to take apart. Embrace their interest.
When a child wants us to buy something we find morally objectionable, we have to remember that it is our child buying it, not us. You have no jurisdiction over your children. What they do can’t be morally wrong for you.
The natural consequence of breaking something is that you have a broken thing. What happens after that is something someone or other decides. Describing making the child pay as a ‘natural consequence’ is at best misleading.