It's not up to the ATF to make laws; congress is supposed to do that.
Also, "sensible" gun control is functionally no different from "sensible" abortion restrictions. If you want to fix gun violence, fix the problems that lead up to it. If you want to stop abortions, it's easier to teach factual sexual health and make sure that everyone has free access to birth control.
Wut?
No, silencers weren't regulated into the NFA by the ATF; congress put them in there, way back in '34. You can read the text of the act here. It's in the very first section:
It's right there in the text.
Aside from that, the ATF per se didn't even exist prior to '72; before that, it was part of the IRS, rather than an agency within the DoJ, and before the IRS, it was part of the Bureau of Internal Revenue.