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.