I also hear that when you scratch the surface, Jimmy Carter is not that nice an individual (despite his four-decade PR charm offensive).
I detest Jimmy Carter.
I served in the military under him as President, and watched him and his administration nearly single-handedly pour gasoline on the middle east with his treatment of Iran.
He was one of the weakest of Presidents, and if there is one thing violent thugs understand, it is how to spot and exploit weakness.
Additionally, he was a vain, vindictive and petty man.