"It's very well known that misogyny is deeply rooted in the radical Islamist worldview," said Shashank Joshi, a senior research fellow at the Royal United Services Institute (Rusi), a London-based think-tank.
On stage was Ariana Grande, the 23-year-old American megastar -and self-styled "dangerous woman" - famous for lyrics that seek to champion female power and routines that exalt the female body.
Dangerous Woman is among Grande's most popular hits: "Don't need permission," the song begins, "Made my decision to test my limits". Grande often appears on stage in cat ears or lingerie. The meaning of her performance - in Manchester, at least - was not lost on her audience.
Melissa Mason, 23, and Rhiana Fitzwilliam, 18, had travelled from Cumbria in the far north of England to see Grande live in concert for the first time. They booked a room in Manchester's city centre and were looking forward to adventure - at the very least, time away from their cafe jobs.
But the sense of independence Grande so often preached in her music was stolen from them, they said, in an attack that seemed to capitalise on their joy and their youthful devotion to one of their favourite stars.
Today, what they remembered was that the arena the night before was filled with many women their age "and Ariana Grande's age, too," Mason added. "It seems purposeful."
"Why us?" she added. "Why this concert?"
As British police continue to investigate the motives behind the attack, these are questions that do not yet have clear answers.
In the statement released taking credit for the attack, Isis did not mention women explicitly, condemning instead what it called a "shameless concert arena". At present, the assailant is not known to have left behind any substantive indication as to his choice of venue.
For analysts, however, a through-line was clear enough even without a letter of intent: the venue was what it was; the victims were who they were.
"There's a connection between the targeting of a concert like this and the enslavement of young girls in northern Iraq," said Joshi.
For Joshi, Islamist ideology has long used the hatred of women as a starting point for condemning Western society seen as immoral and "decadent".
The same persecution of so-called "decadence", he said, could be seen in a variety of "soft targets" since 9/11 - cafe terraces in Paris, a seaside promenade in Nice, and especially a well-known gay night club in Orlando.
"If you go back to early Islamist documents," he said, "misogyny and cultural hostility have often been two sides of the same coin."
