Watching Park Geun-hye and Barack Obama get owned by Kim Jong Un again, it's hard not to wonder who's really insane here.

Conventional wisdom is that the North Korean leader is the nutty one given his propensity for tanking his economy, killing uncles and enjoying the company of Dennis Rodman. Last Sunday, officials in Pyongyang called the South Korean president a "prostitute" and her U.S. counterpart a "pimp" in a wacky diatribe that included claims that North Korea was ready for "full-scale nuclear war." But it's the supposedly rational Obama and Park who are failing the insanity test. By calling on North Korea to scrap its nuclear program, as they did yet again last week, the two leaders are doing the same thing over and over again and expecting a different outcome.

Obama and Park haven't lost their minds. But, even as Kim threatens a fourth nuclear test, they're trapped in a Cold War dynamic worsened by George W. Bush's "axis of evil" policy. Park favors a more enlightened path on the Korean peninsula. She sees reunification as an unprecedented bonanza for Koreans on both sides of the 38th parallel. But any possible detente, she says, is contingent on Kim giving up his nukes. It's too late for that. North Korea has the bomb and, thanks to Obama's predecessor, Kim is not going to give it up.