What are the concerns about Elon Musk's access to the Social Security Administration and the Internal Revenue Service?

Lawrence O'Donnell expresses serious concerns about Elon Musk gaining access to both the Social Security Administration and the Internal Revenue Service. He characterizes Musk's involvement with the IRS as 'very bad' and 'the worst thing we knew about what Elon Musk was doing' before his entry into Social Security. The concern appears to center around the potential risks to these critical government institutions that serve millions of Americans. O'Donnell suggests that Musk's influence inside these agencies could have negative implications for tax enforcement and Social Security payments, representing a significant threat to America's social safety net.