It's an article of faith among Republicans that the Obama administration is and has been Up To No Good, and certainly mountains of evidence would be uncovered if only they could appoint a Special Prosecutor or two to root around for a year. This, as I understand it, is the sole point of trying to make a big deal out of a complete non-scandal (Benghazi) and pretty sorry excuse for a Big Scandal (the IRS thing). Just make enough noise to bring back Ken Starr and an ample staff who can eventually uncover evidence that Obama let someone use his parking pass, in blatant violation of the terms and conditions of the parking rules, twenty years ago.
That is why we live in a nation in which it's an extra-super-huge deal that some people who work for the IRS may have been aggressively thorough with blatantly political Tea Party organizations applying for tax exemptions as "Social Welfare" groups in order to avoid disclosing their donors, and not the slightest bit scandalous that American corporations worth trillions of dollars pay essentially nothing in income tax.
The disparity between what causes outrage and what should has grown so large that it's not even surprising anymore.