@LouisIngenthron We arent talking about complex components, we are talking about mixing two things and getting a high yield explosion.
Why cant i reasonably prevent people from buying 2 chemicals that when mixed makes a high yield explosive. But its perfectly reasonable to say a person cant buy the components of a gun? Buying the trigger group of a gun, separate from the slide, separate from the bullets are all restricted to buy individually AND combining them is illegal. Why can i do one and not the other?
As for poisons, those arent even components, high-potency poison can be bought in the vast majority of circumstances (there are some exceptions) with no restrictions.