The purpose of laws is to balance rights of the populous against measures that protect it. How many batches of P will be prevented vs how many people inconvenienced by the inability to easily access pseudo-ephedrine? I don't think the trade-off is worth it. In fact, I think P should be legalised, taxed and controlled. The supply process will be removed from the hands of gangs, so quality would never be an issue. The enormous tax windfall would be used for education, prevention, rehab, and medical care. Most importantly, someone would be required to get a prescription first, meaning their doctor could monitor their health and progress, and limit their intake. We're applying a band-aid to a large, but easily fixed problem.
Thank the gods you aren't in charge of our country. Your idea of legalising P would quintuple the load on the public health system, quadruple the load on our justice system, and frankly would benefit noone except the funeral industry.
I see you're avoiding hyperbole and sticking to the facts. Good man.