Charlotte Charles and Tim Dunn lost their son, needlessly and senselessly — and now are told to give up hope justice will be done. It’s up to President Trump to see that it is.

Anne Sacoolas, the wife of a US diplomat stationed in England, drove the SUV that hit motorcyclist Harry Dunn, 19, on Aug. 27, 2019. She admitted she was driving on the wrong side of the road and cooperated with police — until she secretly flew back to America, claiming diplomatic immunity.

The United Kingdom charged her in December with causing death by dangerous driving and requested the United States extradite her. Thursday, the State Department announced it had denied the request.

A Dunn family spokesman called it “one of the darkest days in the history of this special relationship” between allies. It was more than that: It’s just frankly wrong.

Americans would be furious if the situation were reversed — and rightly so. Indeed, Washington itself requested a waiver in a similar 1997 case — and got it. Gueorgui Makharadze, the No. 2 official at Georgia’s US Embassy, killed a teen girl in Washington when he caused a five-car pile-up while driving drunk. At trial, he pleaded guilty to involuntary manslaughter and was sentenced to 21 years in prison.

Yet the State Department now claims: “If the United States were to grant the UK’s extradition request, it would render the invocation of diplomatic immunity a practical nullity and would set an extraordinarily troubling precedent.”

Bull.

For all its ancient roots, diplomatic immunity was never meant to allow all criminal activity by those connected to diplomacy to go unpunished. The 1961 Vienna Convention codified rules meant to shield diplomats from threat or abuse by hostile governments.

The United Kingdom is the United States’ closest ally; in no conceivable way is this case an improper effort to intimidate or influence our diplomats.

And British courts are as dedicated to the rule of law as our own — indeed, our legal system is deeply rooted in the mother country’s.

If waiving immunity here creates a precedent for future waivers in equally clear cases — well, good.

The State Department has cloaked itself in shame — even sniffing that the charging of Sacoolas was not “a helpful development.”

As president and as a parent, Trump has the duty to stomp on this idiocy, waive immunity and let justice take its course.