The reason they are allowed to use a crossbow is because they can't use legal archery gear any longer.
By allowing the handicapped and elderly to use a crossbow they are infact saying it's LEGAL ARCHERY GEAR it's just only allowed to them. I don't remember the state rules saying you can use this stuff but it's not legal archery gear. No it allows another form of LEGAL archery equipment to those who cannot pull back a compound, long, or recurve. Just because it's not ok for the rest of the population in your state to use them does not in it's self make crossbows illegal archery equipment.