All progress is precarious, and the solution of one problem brings us face to face with another problem. — Martin Luther King Jr., 1963

People kill people. Stop blaming my Glock.

Take a look at the truly fine citizens who lined up Saturday in irony-free Tucson for a gun show, where you could buy 40-round magazines for AK-47s at $19.99 apiece, or maybe a Glock 19 — the type of gun used in the Jan. 8 Tucson shooting that left six dead and 13 wounded — for $489.

The show’s organizer “extended condolences to the [shooting] victims and encouraged people to ‘lawfully and thoughtfully continue to exercise your Second Amendment rights,’ ” according to The New York Times.

After the show, attendees celebrated the long weekend ending in Martin Luther King Day at the target range, where “Pride (In the Name of Love),” U2’s ode to King and his dream of non-violent societal change, was blaring from the sound system.

Just kidding.

OK, not so much.