It's not realistic to remove all vulnerable young people from places that they may be sexually abused by those who 'think they are older'
Any more than it is possible to ensure that no young men misjudge the age of a girl who convinces them they are older.
I've read many posts here blaming the parents for what happened to this child. I blame the person who picked her out of the taxi line and decided to have casual sex with her.
And he has been dealt with, but her parents/carers still hold some responsibility. It is their duty to take reasonable steps to keep her safe. They have failed to do that - that needs investigating.
What I'm arguing is for the law to be changed to raise the bar on the level of assurance deemed to be acceptable regarding the age of a sexual partner
But you haven't offered any substance to that. What steps can a man reasonably take to ensure that the woman who he believes to be 20, isn't actually 15?
Of course he needs to be careful and mindful, but on very rare occasions like this, an understandable error in judgement was made. I don't believe a change in the law is required when in most other cases, the defence of 'I thought she was 16' wouldn't work because it would not be reasonable to have believed that.
Men need to understand that all children are a gift and deserve protection
Yes, and the primary responsibility for providing that protection lies with the parents/carers. This young man wasn't titillated by the idea of sex with a child, he was attracted to what he and other people believed to be a young woman.