The fist bump took place during Biden's trip to Saudi Arabia to meet with bin Salman.

Biden supporters claim that meeting dictators is sometimes a necessary part of being president. Since Saudi Arabia is one of the world's largest oil producers — one that could easily become friendly with Russia or China (who are labeled as America's "adversaries" or "rivals"), they say — it is imperative that Biden travel to Saudi Arabia to play nice with its dictator.

In a libertarian world, such unsavory conduct would never happen. It's only because of the U.S. war machine and interventionism, both foreign and domestic, that U.S. presidents feel the need to meet with foreign dictators and other foreign leaders.