Justin Welby said, "anti-Semitism is a very unique thing."

Archbishop Justin Welby said, "anti-Semitism is a very unique thing" because (my unique interpretation) it shows you are not fit for high office because you are a friend of "tax collectors and sinners" (Luke 7 v 34) and the hated Samaritans = friend of Irish republicans, of Palestinians and Gazans, to put it in modern dress.  Which very unpopular politician could I be thinking of?

The man was too much pro the poor, the oppressed and the underdog for the British electorate on the 12 December 2019.  Far too sceptical of British military interventions and too enthusiastic for UN settlements, peace keeping missions and for the upholding of international law.

He always maintained that he was anti anti-Semitism but the mud stuck.  He was never believed.
He was anti killing of Gazans and Palestinians but that certainly did not help him when it was Israelis doing the killing.  A very unwise move, indeed.
He was anti killing of people to stop them killing because he was once Chair of Stop the War Coalition.
He was anti militarisation of diplomacy - Afghanistan and Iraq where the West couldn't wait for the UN weapons inspectors to finish their work.  Too desperate for war to let the inspectors to finally and irrevocably declare that Saddam Hussein did not have a single WMD.  The most successful Labour leader in our history, along with an American President, knew better than the gullible weapons inspectors.  But it was the inspectors and Corbyn who turned out to be right, after all.

It reflects badly on my nation that the only Labour leader who won three successive General Elections in a row left parts of the Middle East in turmoil.  Still to this day.  And, Muslims taking revenge on our streets - to this day.
It reflects badly on my nation that this latest Labour leader, who never really wanted the job but found it was thrust upon him, lost two successive General Elections because he was not sufficiently militaristic and war like and, tough like Blair.  Yet, he was shown to have been in the right over our foreign wars.  But, he was branded a Stalinist, a terrorist sympathiser and an anti-Semite because, as an MP, he voted against every foreign war our nation engaged in.
This man stood up for the UN, the rule of law and the International Court of Justice at the Hague.
He wanted war as a last resort, would not retaliate if our nation was attacked with WMD.  Therefore, he was dismissed as unpatriotic, weak, an evil appeaser, a pathetic pacifist and, a friend of the worst kind of people - our enemies.

Being pro Israel and anti antisemitic is very important for the West.  After all, Israel is our flagship state in the Arab/Muslim Middle East.  Robustly on the side of Team America, perhaps even more than ourselves.  Jews are amongst the very top people in our society.  Therefore, to be critical of Israel, in anyway, is to be disloyal to one's own Western culture and nation.  A security risk.  Disloyal.  Certainly, antisemitic.

They say you can be critical of Israel without being anti-Semitic but I have tried.  Ian Austin the former Labour and then Independent MP said I am anti-Semitic for expressing dismay that our UK Jewish community is more up in arms about antisemitism than their compatriots killing and injuring Gazans in rather large numbers.  It is a clever way to intimidate into silence people's legitimate horrors of, too often, Israel's behaviour towards their neighbours.  Neighbours to whom they should be Good Samaritans - and vice versa, of course.

Clearly, because our top ranking Jewish friends look just like us good white Brits, their sufferings, their Holocaust and that genocide must be put on a pedestal far above any other suffering, or persecution, or racism or genocide.  Israel and all the Jewish community are very special, after all.  They deserve special treatment, as the people of the Bible and with their sufferings in the Shoah (that we Western 'Christians' was responsible for).  Antisemitism deserves tougher treatment than with Islamophobia against the Muslims.  Only prejudice/hatred against the Jewish community must be placed in a unique and top category of racism.

Hence, for the Archbishop, antisemitism "is a unique category of racism ... not the same as other types of racism."  "It's the taproot of all other forms of racism."  "Anti-Semitism is the longest existing and (has given the) worst results of any kind of racism that we have experienced in Europe in the last thousand years. ... So it has a category all of its own."   'The Big Issue - Christmas Special', December 2019.