Given the prevalence of P2P meth and apparent inability of governments to do anything about it, this does not seem like a rational position to me. If there was any reason to believe that large scale production will ever be substantially curbed, there might be a case for it.
Yes, P2p meth is rampant and cheap. However I look at it like this: Meth addicts will absolutely decide to become chefs if the ingredients are readily available, even if there's a McDonalds down the street. You're approaching this rationally, which is not what meth addicts are going to do.
If it is readily available down the street, it looks to me that people cooking their own is a superior outcome for society in every single way than they buying it down-street.
Even more if the professional labs close down due to lack of customers.
A buddy of mine worked his way through college cleaning out meth labs in homes and motels after they had (typically) blown themselves up. They are toxic nightmares. He was especially shaken when he'd find the family photos indicating that the labs were operating while children were in the home.
The professional labs would absolutely not close down due to lack of customers, there would just be even more meth available, more contaminated, with the bonus of hazmat sites peppering communities.
