So said the immortal sage and Republican role model Dirty Harry Callahan in Magnum Force, and truer words were surely never spoken.  There was once a time when John McCain lived by them:

This is from Larry King Live, 4/23/1991, when he was arguing deposing Saddam:

MCCAIN: Third of all, I’m not sure that if we did go in on the ground we could tell a Shiite from a Sunni, even from a Kurd. And who is it that we’d be fighting and battling against on the streets of Baghdad?

Oh, for the good old days, when McCain at least knew what he didn’t know.