What are these parents saying? Are they saying that it's all a lie, that no child was ever shouted at, that there were no seminars on how to instil "healthy fear", that no child is in therapy following the emotional abuse suffered at Mossbourne?
No, they are not.
They are saying some variation of "my child wasn't abused so I don't give a flying fig about other children" and "I agree with these methods and f* the detractors".
Let's make a simple comparison, shall we?
I didn't like my old boss and my ex partner, but neither was toxic. My replacement and my ex's new partner seem to be thriving. My 2 cents is something like: "I didn't like them but other people may well do".
Now suppose your current boss abuses other colleagues.
Would you say: "oh, you know what, he abused other people but he didn't abuse me, so all is fine"?
This is the appropriate comparison.
Anyone who fails to appreciate it is unfit to be a parent and should be stripped of parental responsibility.