The ATF has no explanation for how an ATF agent’s gun ended up at the scene of a mass shooting in Mexico. To be clear, this isn’t one of the thousands of guns the ATF trafficked to Mexican drug cartels, this was a gun personally purchased by ATF agent George Gillett. (The purchase also apparently was illegal, as Gillett used a false address.)
At this point I’d like to mock the ATF by suggesting they lose their authority over firearms and instead be placed in charge of some other enforcement they might be competent at, but I can’t think of what that might be. Maybe pet licensing?