Donald Jr no doubt can feel outraged at being told to be vigilant, he always flys on a private jet. He's chauffeured here and there when he's on the ground. And now he has taxpayers paying for his round the clock security.

Those of us who aren't coddled by privilege are wary of unattended baggage and mysterious parcels. We dutifully line up to go through metal detectors, empty our pockets and take off our shoes. We keep our ears and eyes open for people acting suspicious or being out of place.

Collective security is what every citizen of a large city learns. Cities are homes to various people with their own inner politics, which may erupt from time to time.. There's apolitical gang violence then there are separatists, like the provisional IRA, or ISIL, or there are attacks on ex-pats like those of the Russian secret police on Putin's critics living in London.

Donald Jr hasn't learned the first rule of politics: When there's a public tragedy, don't try to score cheap political points