Where there is smoke there is fire. This was a coordinated effort that included far far more than the IRS. The effort included at a minimum the IRS and an outside political intelligence gathering organization that both provided specific information to the IRS and as well gathered specific information from the IRS. This outside entity remains in operation TODAY.
Groups and individuals targeted by the IRS were also investigated by the FBI, ATF, EPA, etc. These were orchestrated attacks with coordination among federal agencies. This is the most frightening part of all.