Americans had to get used to Donald Trump breaking all the rules of presidential campaigning, and it looks like the world will have to adjust to a President Trump who will also violate diplomatic convention. One early lesson is not to overreact to every break with State Department protocol as if it’s the start of World War III.

The U.S. media had their 19th nervous breakdown Friday after the Trump transition said the President-elect had taken a congratulatory call from Taiwan President Tsai Ing-wen. Mr. Trump also later tweeted that he had spoken to “the President of Taiwan.” Doesn’t he understand this simply isn’t done? No American President or President-elect has talked to a Taiwanese President since 1979, and this violation of tradition is being portrayed as a careless, bone-headed provocation to Beijing.

Well, maybe it was calculated—and perhaps even useful. Trump Asia adviser Peter Navarro has advocated cabinet-level visits to Taiwan and an end to the U.S. bow to Beijing’s “one China” policy, which insists that Taiwan is part of China and shouldn’t be treated as an independent state. Perhaps that goes too far, but it is past time for the U.S. to recalibrate its Taiwan policy.

Ned Price, spokesman at the Obama National Security Council, suggested that Mr. Trump made a mistake, saying the U.S. remains “firmly committed to our ‘one China’ policy based on the three Joint Communiqués and the Taiwan Relations Act.” But the communiqués from the 1970s and ’80s do not say that the U.S. supports Beijing’s view of “one China,” only that the U.S. acknowledges that both China and Taiwan agree on that principle. That is a crucial distinction.

Taiwan and the world have also changed since those communiqués. Taiwan has become a prosperous and democratic polity integrated into the world economy. Most Taiwanese now want to maintain their de facto independence. They resent Beijing’s bullying to force their leaders to move toward reunification.