If someone is exhibiting a belief in extremist ideas, they may be referred to what’s called a Channel Panel, whose membership will be drawn from local agencies relevant to the individual’s case, like social services, youth offending services and so on. The panel decides if that individual would benefit from referral to a specialist mentor like Mr Qadir to change their ideas before they become involved in terrorism. A first stage in the development of extremist ideas can be, as Mr Cameron has said, a belief in conspiracy theories about Jews exercising malevolent power.

So what about this tweet from Mr Qadir when Israel launched Operation Protective Edge, its 50-day military assault on Gaza to stop rocket fire into Israel in the summer of 2014? “A whole nation is being radicalised to exterminate the Palestinians. Where are the interventionists? Who is going to prevent this Terrorism?” “Exterminate”? There could be no more serious, nor tendentious, charge against Jews.

The UN estimates roughly three civilians for every combatant were killed in Protective Edge; the Israelis say it was half that rate. But even if the UN are correct, that was still no higher than the NATO ratio in Afghanistan — a brutal reality about asymmetric urban war, especially since Hamas deliberately moves its fighters into civilian areas knowing that would constrain the IDF. “For the Palestinian people, death has become an industry, at which women excel, and so do all the people living on this land” said Hamas MP Faithi Hammad in 2008. “The elderly excel at this, and so do the mujahideen and the children. This is why they have formed human shields . . . It is as if they were saying to the Zionist enemy: ‘We desire death like you desire life’.”

The charge of “exterminate” is the kind of wild and disproportionate canard now routinely directed at Israel. As Baroness Ruth Deech says, a cult of “fashionable disgust” has taken hold. Yet it surely feeds the grievance culture whilst simultaneously inflaming hatred (as distinct from legitimate criticism) against Israel.

This mind-set dismisses as mere “detail” Israel’s long history of treating Palestinians in Israeli hospitals as a matter of basic humanity. In 2010 some 180,000 Palestinians are reported to have been treated in Israel. Two weeks into Protective Edge the Israeli army set up a field hospital near the border with Gaza to treat the injured and wounded caught in the crossfire and sent in medical supplies during a brief ceasefire.

Even Israel’s sworn enemies are treated. The daughter, granddaughter and brother-in-law of Hamas prime minister Ismail Haniyah and relatives of other Hamas officials are all reported to have been treated at Israeli hospitals. So were the wife and brother-in-law of Mahmoud Abbas, president of the Palestinian Authority. That doesn’t sound like the conduct of a government intent on “exterminating the Palestinians”. Nor does the $10 million which the Israeli foreign ministry says has been spent to expand the border crossings into Gaza since 2014 to allow in 1,000 aid trucks per day.

If anyone is bent on extermination, it is Hamas, and the infamous Article Seven of its 1988 Covenant quoting the Prophetic injunction to kill Jews, which Hamas apologists keep saying is outdated but which Hamas itself has yet to rescind.

At the height of Protective Edge, Mr Qadir also tweeted a picture showing Israelis supposedly playing badminton inside the Al-Aqsa mosque, Islam’s third holiest site, located on the eastern edge of the Old City of Jerusalem. He wrote: “So this isn’t anything to do with religion or deliberate acts to undermine islam & Muslims. Who are the extremists???”