Just say "no"? It is your house, your child, you are the person with all the decision making power here. I simply do not accept you cannot stop it if you want

Just say "no"? It is your house, your child, you are the person with all the decision making power here. I simply do not accept you cannot stop it if you want to. So i guess my question is "why is trying to manage the fallout easier than proactively preventing it"?