I know, I know, I hear it to. And seriously, I don't know what the answer is, because if you tell them PR works on X,Y,Z, they'll find a "yeah but". I think there are people out there who PREFER to manhandle their dogs for whatever reason. And for that I have no answer other than to hope we continue to evolve as human beings.
I have a 140# great dane, gone feral, eating livestock, shot at at least twice, had to be caught in a live trap... He landed in the county shelter, destined to be PTS after his stray hold. MAGDRL helped us get him pulled and in the meantime he badly failed the temperament test.
This is a dog who bit the shelter evaluator and my husband. This is a dog who had been fending for himself as a feral, who had been clearly abused before then.
We rehabbed him using 100% PR. He was our first completely PR rehab and he is our biggest success.
I knew intellectually that he was going to have to be safe around our kids, and that even though I'm a big girl, no way could I overpower a full grown great dane.
Some things you just have to experience for yourself.