I'm still annoyed alcohol isn't administered by the Food and Drug Administration. It's both a food and a drug. I want nutrition labels (mostly for the calorie count) on my alcohol. They don't have them because the ATF does not require them as the FDA does.
Honestly, the ATF can just be split with half being folded into the FDA and the other half folded into the FBI. The ATF doesn't need to exist.
Although neither the ATF nor DEA existed before the 70s, part of the reason might have to do with ATF’s precursor existing for a really long time, before we cared about many other drugs. DEA pretty much came about under Nixon’s war on drugs.