The phosphorous crime in question is using it as a reagent in a few illicit drug synthesis paths (and poor ones too), specifically methamphetamine. So yes, the

The phosphorous crime in question is using it as a reagent in a few illicit drug synthesis paths (and poor ones too), specifically methamphetamine. So yes, there have been a plenty of phosphorous related crime. Now, whether we should allow just about anyone to synthesize meth is a different and more pertinent question. Synthesis alone is not especially dangerous, illegal distribution is... and this ban was taken to curb it. It is not especially successful. (Also limits on saffrol and sulfuric acid for other drugs.) In comparison, production of explosives is dangerous. Risks fire and explosions, therefore should not be done on a bench top by just about anyone. (And reason for limits on nitric acid.) Chemical disposal is also a quite minor problem.