PaulNoel said:

Well here is a classic environmental thing.  Most pyrotechnic power in commercial displays does use perchlorate, but most consumer stuff is "black powder" based and that is Potassium Nitrate based.   Actually this whole fireworks issue is just one more case of needing to tell  people they cannot do something a certain way.   The alternatives will take the field.  

This brings up the biggest fireworks issue which is safety.  Most pyrotechnic devices are unsafe because they are unreliable in ignition and operation.  If safety rules were required for reliability and such on fireworks the price would be trivially higher and the use would be extremely safe.  For example nearly everyone knows that primers for gun shells are extremely reliable and honestly unbelievably safe and predictable in operation.  If fireworks were that reliable such that you could set off a rocket and have it actually do what it was intended to do and  do it certainly, the incidence of accidents would be trivial.  Similarly if the ignition was by a mechanical impact or electrical signal or similar that was as reliable like gun shells the accidents and explosions with burns would be mostly forgotten.

It is quite feasible to have fireworks that you could pull a string and have it ignite reliably.  It is quite feasible to have impact or electrically ignited fireworks.  The incidence of junk fireworks that are honestly not that cheap but do not work reliably is just unacceptable danger to everyone.  

 If you set clear rules for the business things work.  As long as clear rules are not set the least common denominator will rule the field.  This applies to many fields of endeavor.