I feel really, really uncomfortable with this notion that ABA is somehow 'denying' peoples' autism, which kept being brought up in the programme (by the anti-ABAers of course). Ime it is absolutely not about this. It is not a 'cure' for autism. It is a method, tailored to the exact needs and difficulties of each individual child, which teaches skills based on a really really simple principle (which starlight has explained clearly).
It doesn't take anything away. It adds to a child's skill base, their ability to communicate effectively, to interact, and to engage.
No of course stimming doesn't do any 'harm'. But it can interfere with a child accessing experiences. And when a stim causes harm to another person (eg headbanging/hitting someone) then what do you do? Accept it as part of a person's 'condition'? God. There is still such a low expectation from people with autism, that somehow by teaching skills it denies them to be the person they are.
I have no judgement whatsoever about how other people bring up, or teach, their children, but this thoughtless, ignorant stance against a method of expanding an autistic person's life experiences and skills drives me mad.
We have done 3 years of relatively intensive ABA (verbal behaviour method, exclusively done in the natural environment) with my ds. I have seen pretty much all of the sessions he has had. Not once was there cruelty or punishment. (Unless you would consider punishment to be him not being allowed to get sweets by hitting me.) The 'distress' he went through was no more than my NT dd goes through if she demands cake and I say no.
The endless clips of extreme 60s/70s methods (which I expect weren't even that representative at the time) were so damaging. I wonder what clips of 'special schools' of the same period would have looked like by comparison? 