The politics of the hijab
Ms Sarsour co-led the Women's March on Washington after Donald Trump's election, a march that expressly portrayed the veil as a symbol of feminist struggle, despite millions of women around the world being forced or pressured to wear it.
Just as she and her identity politics fans have never joined Iranian dissident Masih Alinejadin her campaigns against compulsory hijab in the Islamic Republic, or backed exiled Saudi women's activist Moudhi Aljohani in her push to stop Riyadh's enslavement of women, they are not standing against the deadly Islamic ideology of purity and honour that provides context and clues to the motives of the suicide bomb attack in Manchester.
They brandish their veils as a standard-bearer of liberation and speak out when veiled women are harassed or attacked, however there is little or no solidarity when victims are not hijabis.
This week, for example, when two brothers were acquitted in Turkey of helping the "honour killing" of their sister in Berlin because she refused to wear a hijab and dated a German boy, the homegirls were nowhere to be seen.
Under fire for her virulent anti-Israel stance, claims "Zionists can't be feminists", and support for convicted terrorists, Ms Sarsour has instead presented herself as a victim of a far-right campaign of vilification after her opponents protested against her speaking at a graduation ceremony at a New York university this week.
The ignoring of Islamic purity culture is not a coincidence
Across the Atlantic in the United Kingdom, outspoken hijabi Remona Aly wrote an op-ed in The Guardian in which she praised Muslim outreach to saddened Mancunians, but failed to mention the radical Islamist worldview that says young girls attending a pop concert with a singer dressed in seductive clothes are prostitutes and deserve to die.
Waleed Aly, whose veiled wife Susan Carland downplays liberal Muslim women's critiques of religious fundamentalism as unfair and not "faith positive", wondered in the Sydney Morning Herald if the attacker Salman Abedi "specifically understood he was striking this demographic of mostly adolescent girls".