People also make meth in the privacy of their own homes... So do laws banning meth only exist to make people feel good?
Actually the answer is still yes, as it is with most casual drug use of ANY kind of drug. Some countries have legalized all drugs, understanding that then they can help the small number of people who get addicted instead of being able to use drugs responsibly.
However meth is a bit of a special case, because the making of it basically renders a home unlivable, and poisons the other people living there or even nearby. But you still shouldn't ban meth or meth ingredients, just require it be made in proper facilities.