The relationship between IRS agents and them being armed goes way back. Keeping in the back of our minds that the IRS was responsible for upholding prohibition, it was those agents tasked with taking down all the gangsters.
We all know that prohibition of any kind does not generally work, with alcohol prohibition being an abject failure, the whole debacle acted to put our government executive agencies on steroids.
With other three letter agencies now out there since the days Capone was handing out turkeys to those in need have passed, why is the IRS still armed? Someone somewhere could probably give me a full run down, but suffice it to say not too many people are pleased by the rumored 80,000+ potential new hires to the agency, and they’re presumably going to be armed.