I personally know several parents with headbangers they've never disciplined, and who were only too delighted to find out their kid has...ADHD. Ahhh-ha!... Well that explains everything; it explains why Johnny gets bad grades, bites other kids, throws his crayons, won't listen, etc. ...It's not MY fault.
That’s a sad statement to be able to make. Parenting under normal circumstances is hard, and anyone who is happy about getting a spectrum diagnosis just so they can justify their lax parenting is deplorable, IMO. It paints all parents of spectrum kids with a broad brush when that is not the case.
There always seems to be people looking for a free ride and are willing to cheapen the gravity of the matter to get one. Despicable!