I tryed to ship a paintball gun (NOT a "gun". I know, completely different, just hear me out) through UPS at a UPS store. Of course, the guy refused to ship it, said his superviser said they couldn't. I went home, read there TOS and restrictions, and was very pissed off. I then checked Fedex's TOS and restrictions, same result. So, I boxed it up at home, brought it to a fedex kinkos and didn't say what was in it.
Obviously not the same situation, but I did realize why they won't ship these things at small locations, the guy at the UPS store and kinkos was clearly not smart enough to tell whether or not something was dangerous. Even though the TOS/TOU say nothing about not being able to ship these items at those locations, I understand why.
Though it shouldn't be our problem if they can't trust their employees.