This thread is heartening in its (almost) blanket condemnation of the assaults and the ability of posters to grasp the basic idea that it's a cultural and sexual, not a racist issue.
There were, according to friends who were there near the Cathedral, no large groups of females of N African or ME appearance.
Hopefully that will shut down the dangerous knee-jerk reaction that this debate is remotely racist.
I believe, sadly, that the message of 'open arms' has backfired spectacularly.
Europe reminds me of laid-back cool-signalling parents allowing their kids to have anyone round for a party. They've now come home to total devastation and are trying to get their heads round the fact that inviting complete strangers into their house does not automatically guarantee that they will respect it or even know how to handle such unknown freedom.
If they'd stuck around, or laid down firm ground rules and consequences, made a few examples of those who behaved inappropriately, then they would be taken seriously.
It's their kids who are clearing up and the others get away scot free.
Possibly a clumsy analogy, but the writing has been on the wall for a long time.
And those of us with empirical experience of those other cultures have long been pilloried and silenced as 'racists.'