There is a categorisation of victimhood in left wing thought.
Some groups are worthy of support, others not, and there is a league table in which priorities are assigned. Right at the bottom are Jews (you will hear the Holocaust dismissed as a " white on white" crime by leftists) and right at the top are Muslims.
Nothing trumps Islmophobia. And feminists, or gays, who are themselves victimised by Muslim fundamentalists, had better get used to it because that is how it is.
Combine that with the leftish moral superiority and you can see why we get how we get the current ant semitism disaster for Labour.
Does Labour court the Muslim vote or do Islamists use entryist tactics? Probably a bit of both, but it is the left's advocacy of "Islamophobia" as the greatest evil on earth that is the root of it all...