Four decades ago South Korea’s President Park Chung-hee, father of the current president, launched a quest for nuclear weapons. Washington, the South’s military protector, applied substantial pressure to kill the program.

Today it looks like Park might have been right.

The Democratic People’s Republic of Korea continues its relentless quest for nuclear weapons and long-range missiles. The South is attempting to find an effective response.

Although the DPRK is unlikely to attack since it would lose a full-scale war, the Republic of Korea remains uncomfortably dependent on America. And Washington’s commitment to the populous and prosperous ROK likely will decline as America’s finances worsen and challenges elsewhere multiply.

In response, there is talk of reviving the South’s nuclear option. Won Yoo-cheol, parliamentary floor leader of the ruling Saenuri Party, told the National Assembly: “We cannot borrow an umbrella from a neighbor every time it rains. We need to have a raincoat and wear it ourselves.”

Chung Moon-jong—member of the National Assembly, presidential candidate, and Asan Institute founder—made a similar plea two years ago. He told an American audience “if North Korea keeps insisting on staying nuclear then it must know that we will have no choice but to go nuclear.” He suggested that the South withdraw from the Nuclear Nonproliferation Treaty and “match North Korea’s nuclear progress step-by step while committing to stop if North Korea stops.”

The public seems receptive. Support for a South Korean nuclear program is on the upswing, hitting 66 percent in 2013. While President Park Geun-hye’s government remains formally committed to the NPT, Seoul has conducted nuclear experiments and resisted oversight by the International Atomic Energy Agency.

Of course, the idea triggers a horrified reaction in Washington.

Unfortunately, in Northeast Asia today nonproliferation operates a little like gun control in the U.S.: only the bad guys end up armed. China, Russia, and North Korea all have nuclear weapons. America’s allies, Japan and South Korea, do not, and expect Washington to defend them. To do so the U.S. would have to risk Los Angeles to protect Seoul and Tokyo—and maybe Taipei and Canberra as well, depending on how far Washington extends the “nuclear umbrella.”

While America’s overwhelming nuclear arsenal should deter anyone else from using nukes, conflicts do not always evolve rationally. South Korea and Japan are important international partners, but their protection is not worth creating an unnecessary existential threat to the American homeland.

Better to create a balance of power in which the U.S. is not a target if nukes start falling. And that would be achieved by independent South Korean and Japanese nuclear deterrents. Such a prospect would antagonize China. But then, such an arsenal would deter the People’s Republic of China as well as DPRK. Which also would serve American interests.

Moreover, the mere threat might solve the problem. When faced with the prospect of Japanese and South Korean nuclear weapons, China might come to see the wisdom of applying greater pressure on the North.

The U.S.-ROK discussions over THAAD may have encouraged Beijing to indicate its willingness support a UN resolution imposing more pain on the North for its latest nuclear launch. The prospect of having two more nuclear neighbors would concentrate minds in Zhongnanhai.

Abandoning nonproliferation is not a decision to take lightly. No one wants a nuclear arms race.

But the PRC already is improving its nuclear forces. And allowing North Korea to enjoy a unilateral advantage creates great dangers.

So as I wrote for National Interest: “policymakers should consider the possibility of a nuclear South Korea. Keeping America entangled in the Korean imbroglio as Pyongyang develops nuclear weapons is a bad option which could turn catastrophic. Blessing allied development of nuclear weapons might prove to be a better alternative.”

Park Chung-hee was a brute, but his desire for an ROK nuclear weapon looks prescient. Maybe it’s time for the good guys in Northeast Asia to be armed as well.