Stuff like this shouldn't even be an ATF decision. Why are they lawmakers? I sure didn't elect any ATF agents. Did you?
That's the biggest single problem we have, if I had to choose just one: the delegation of lawmaking authority to bureaucrats. Nobody elects these bureaucrats, and now with the degree of NSA spying that has come to light (i.e. spying on elected officials), there is a very real question of who has authority over whom. Who is really in charge, the people's elected representatives or the entrenched bureaucrats?
Mark Steyn is fond of pointing out that you don't need permanence in your President or Congress as long as you have a permanent bureaucracy. Elections come and go, majority parties come and go, committee chairs and memberships come and go, but the bureaucracy never changes. It's always there, and regardless of who is in elected office the bureaucracy will invariably work toward that which aggrandizes its own power and funding.
This whole thing of Congress passing large, comprehensive bills and allowing the alphabet agencies to fill in the blanks as they deem necessary has to be ended some way, somehow. It must be put on the new list of "injuries and usurpations".