From a reader:

Mr. Goldberg-
Obviously you must have been flooded by angry Army personnel over recipients of more than one Medal of Honor, which is to be expected. The original email that you posted actually is rather correct in a narrow sense, in that Gen. Butler is still the only Marine Corps Officer to receive two MoHs. Gy Sgt. Dan Daly is the other two-time Marine recipient.
As for Gen. Butler’s rather outrageous political views – Max Boot in his excellent book, “The Savages Wars of Peace” ascribes them to his defeat in the 1932 Republican primary election for open Pennsylvania Senate seat, if my memory serves me correctly. It was only after them did he embark on his pacifist bent that characterized his story until his death.