^
If you ever come across press coverage of female sex offenders, they seem particularly prevalent amongst women in a position of power, e.g. teachers, perpetrated against minors. The sort of situation we are discussing here.^
Except we're not discussing that situation. A female passenger is not in a position of power the way a female teacher is. A female passenger has been chosen by someone else to sit next to that child, a teacher has self-selected to be in a position of power over children. That women self-select into positions of power to hurt people is well-understood and no one denies that it happens, e.g. Beverly Allitt (sp?) the killer nurse. By that argument, that a person self-selecting into a role may be doing so for unsavoury reasons, a random female passenger would be safer than self-selecting cabin crew.
I'm going to guess, based on what others have said about UMs getting a row near the crew, that the girl next to me was overspill from that row. In which case, putting me next to her was the safeguarding option of last resort. Now, I could have argued that ex-bf wasn't going to molest anyone and I would vouch for him, but doing so would have been demanding that the girl, her parents, and the airline trust my judgement. In the wake of the Cromwell Street and Moors murders where mixed-sex couples conspired to torture rape and murder, such objection ought to raise huge red flags about both of us. My point is that these processes exist for a reason and the right thing to do is comply.