We might find the W.H.O.’s politics unseemly. At times they are certainly troubling, especially regarding Taiwan. (Though in fairness, most of the world, including the powerful U.S., has also officially shunted Taiwan in deference to China.)
But they are an inevitable, if not necessary, evil for an organization run by 194 countries full of rivalries, self-interests, and division. Its weaknesses very much reflect our own. International cooperation is not about singing kumbaya and getting along harmoniously; it is the sober and practical realization that, however divided the world is, there are problems bigger than any one country can handle (look at how the richest country in the world has struggled to contain this pandemic). That means making difficult, imperfect, and sometimes even maddening compromises.
It took working with a murderous bastard like Stalin to beat the Nazis in WWII, with the Soviets accounting for 80-90% of Axis losses at the cost of tens of millions of lives. (We also had to work with the bastard Nationalists and Maoists in China to accomplish the same feat against Japan, with the Chinese tying up most Japanese forces at similarly horrific costs.)
In the context of public health, this is nothing new. Even at the height of the Cold War, countries including the U.S. and the Soviet Union managed to set aside their differences and work through the W.H.O. to eradicate smallpox, a scourge of humanity that had killed hundreds of millions just in the 20th century.
With over 50 million cases and 2 million deaths annually, in 1958 Soviet virologist Viktor Zhdanov became the first to call on the W.H.O. to lead a global eradication effort. In 1966 Canadian-American epidemiologist Donald Henderson formed the U.S.-led Smallpox Eradication Unit to assist in this endeavor. A year later, the W.H.O. intensified global smallpox eradication with millions of dollars from around the world and a method developed by Czech epidemiologist Karel Raska. The Americans and Soviets provided most of the initial vaccine donations (no doubt, at least in part, to one up each other).
By 1980, the W.H.O. declared smallpox eradicated—the first human disease wiped off the face of the Earth, thanks to global cooperation.