HolyHannah I don't know if your MH health problems make you unable to parent properly. I hope that's not the case. I certainly wouldn't assume that everyone who has MH problems is unable to parent their own children, with appropriate help if they need it.
However, as someone whose mum was an abusive and dangerous schizophrenic I know that health professionals often do not intervene when they should. I have also have a friend whose husband was a schizophrenic - he almost killed their children and did kill himself, and the wife could not get him the help he needed.
So I can say from experience that there are cases where intervention is needed and doesn't happen. A caring parent of an adult child with mental health problems will try very hard to get them their adult child the help they need and to protect any grand children.
But yes, there are also people who will use any mental health issues as a way to push their agenda forward rather than support the one with those health issues. Historically people could lock their relatives away in a mental asylum when they weren't even mentally ill. Women were much more often the victims of this.
If your parents used your MH issues against you it's a fair bet they would have used something else against you if they didn't have that lever. But there are other cases where people with MH issues do not realise they need help.
As for the Karen things, nobody is accusing you of coining it. However there are lots of unpleasant bigoted terms around that I didn't coin that I'm sure you would call me out if I used. Tying behaviour to a specific type of woman who happens to be white and of a certain age and socio-economic group is no less bigoted than tarring all people of any other group with equally unacceptable behaviour. And no I'm not of that socio-economic group. From wiki "As of 2020, the term was increasingly being used as a general-purpose term of disapproval for middle-aged white women." Research further and you will see a lot of division as to the origins and meaning of Karen. But that is the problem, using a term that can be interpreted in more than one way will convey ambiguous messages. If you want to call out a certain kind of behaviour, name the behaviour clearly, I would say. And I can't help feeling sorry for anyone who happens to be called Karen. Thank you to both star and Iam for your helpful input on this too."
Sorry too tired to read any more of the thread, just came down for painkillers and popped my head in while they kick in.