Oh, I dunno...:
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...just ask the readers of "GQ" magazine.
Also those who voted him in as Mayor: mainly white Londoners.
That reason is why your 'argument' will always have it's throat slit: as those whites who don't think like you - and never will - represent the ultimate paradox for the likes of you.
Sadiq Khan is why your 'agenda' is dying: certainly after Charlottesville.
Just ask those who voted for Jo Cox after what one of your kind did to that Labour MP.
Sadiq is a member of the Labour Party too.
You know what happened to former senior member of the neo-Nazi National Front Nige FaRAGE a few months ago, do you not? And why the same Conservative government you would have prayed to have destroyed Jeremy Corbyn on 8th June had, late last year, declared Nazis - including National Action - to be officially terrorists.
I refer you to a certain Thomas Mair. Ergo your entire 'argument', re. Sadiq Khan, has no right to exist.
Indeed: it deserves to have it's throat slit.
It's part & parcel of living in a world with a Nazi-lover in the White House.