Jamieson, Fausset and Brown on Zechariah 11:17

17. the idol--The Hebrew expresses both vanity and an idol. Compare Is 14:13; Da 11:36; 2Th 2:4; Re 13:5, 6, as to the idolatrous and blasphemous claims of Antichrist. The "idol shepherd that leaveth the flock" cannot apply to Rome, but to some ruler among the Jews themselves, at first cajoling, then "leaving" them, nay, destroying them (Da 9:27; 11:30-38). God's sword shall descend on his "arm," the instrument of his tyranny towards the sheep (2Th 2:8); and on his "right eye," wherewith he ought to have watched the sheep (Joh 10:12, 13). However, Antichrist shall destroy, rather than "leave the flock." Perhaps, therefore, the reference is to the shepherds who left the flock to Antichrist's rapacity, and who, in just retribution, shall feel his "sword" on their "arm," which ought to have protected the flock but did not, and on their "eye," which had failed duly to watch the sheep from hurt. The blinding of "the right eye" has attached to it the notion of ignominy (1Sa 11:2).