Or maybe they just practiced until they could do it, because (like the magic eye pictures) it was the cool thing
And because concentrating on maintaining this way of seeing takes concentration from other things
But if you read a news report (or analysis) about someone referred to as "she" you will find it hard to recognise they are in fact male.
fairplayforwomen.com/pronouns/
Safeguarding - the system for protecting children from abuse and maltreatment is like the system of roadsigns.
Clear unambiguous communication is paramount.
And at the same time insist we exert cognitive effort to maintain hard-to-maintain mis-messages (like trying to believe sex is a social construct)
We *could*"queer" road signs and make them harder to read and more ambiguous, but it wouldn't make roads safer for the people who share them.
They know that, but they believe (often accurately) that if they stop concentrating and the picture pops out of 3D something awful will happen to them individually..
But meanwhile the optical illusion is being used to corrupt the systems meant to protect the most vulnerable.
Something awful is happening collectively.