What Durruti fails to identify is the central role of Britain in the Israeli/Palestine conflict, which is far more direct than Britain's indirect role in other global injustices. It is also at the sharp end of global imperialism. Britain and America back Israel as a tool to dominate the oil fields of the Middle East.
It was the British who first offered the Zionists a homeland in an area that didn't belong to them, that our ruling class occupied (The first intifada was actually the 1936 Arab revolt in Palestine against British occupation, part of a wave of anti-colonial struggles across the Middle East - Zionist militia aided the British army in putting down the rebellion).
It is Britain who have bloc-ed with America in blocking ceasefires both in the Lebanon and in the war on Gaza.
It is Britain that leads the EU in blockading Gaza and in the attempts to destabilise the democratically elected administration that the Palestinians have elected.
It is Britain (along with France & Germany) who are offering Israel to send war-ships to blockade the flow of weapons into Gaza, while they relentlessly arm the occupying power.
We could go on.
The idea that this is all an opportunistic ploy of "The Left" to court Muslims is bogus. Actually, the solidarity of the Western Left with Palestine goes back decades. Tariq Ali toured Palestinian refugee camps in the aftermath of the six days war. Or to give an example,the SWPs predecessor organisation the IS were involved in teach-in's at the LSE in '68 in support of Palestine:
http://www.socialistworker.co.uk/art.php?id=11874
If you read a very good book on the history of the PLO by Alain Gresh, he argues that much of the thinking of the PLO - their adopting in '68 of the slogan that they were for one secular, democratic state of Palestine where Jews, Arabs, Christians, Muslims whatever could live in full equality (rather than the slogan of the Arab regimes which had been to drive out the Zionists) was influenced by the participation of Palestinian exiles in Paris May 1968 where people asked them, 'what is the nature of your revolution?'
The Black Panthers supported the Palestinians in the '60s.
The history of solidarity of the western far left with the Palestinians (much of it spearheaded by Jewish trotsyists and non-stalinist socialists like Nathan Weinstock, Isaac Deutscher, Tony Cliff, Maxime Rodinson, Ernest Mandel and others) goes back years.