I totally agree with you that INTJs make great leaders when no one else wants to or has the expertise. I find them fair and capable, but usually reluctant leaders.
I ALWAYS try to give people a fair shake, and I admit when I am wrong . . . but perhaps that is because I was raised by an amazing man who taught me that a leader is only as good as his staff. He used to give me practical advise like, if your employees are complaining about their jobs, call a meeting have them vote on the worst job and then do it for them. They will be so thankful that there will be no complaining after that. He was always telling me to appreciate the talents of the little guy. I don't know what he was, but I know he was more of a feeler, acting the "hatchet" man sent him to the hospital for a triple bypass . . . . Maybe an ENFJ?