'I do think it is so widespread, so insidious, and it is enacted by pressure exerted on individuals, it deters against openness about how widespread it is.'
Which is why so many schools and LAs are so against Applied Behavioural Analysis despite the impressive and wide evidence base, as it would hold the school accountable for every minute of the TA's time.
I think teachers are unprepared to be honest even with themselves to they tell themselves stories about how the TA being 'reallocated' is 'good' for the child in question, or if not, 'the only way they can possibly manage their unreasonable workload and manage the class 'for the sake of the child with SEN too''.