I don't think the doctors were stupid to believe in this hogwash that cochlear implants cure deafness regardless of how the children became deaf. I think they were blinded by the medical benefits of cochlear implants to realize that these implants aren't for everybody. They probably were given money to promote these implants as the only choice for the parents who actually did choose them instead of looking into other alternatives.
CI requirements to become a candidate are moot points when it comes down to actually being able to use the implants once they're put in. I knew a deaf guy many years ago who went through a battery of tests and requirements to become a candidate for the cochlear implants when they first became available. I think in fact he was the first to become a candidate in the state I lived in at the time, but that's a long time ago. He got the implants and had them activated. He heard nothing. They didn't work despite the efforts to amp up the loudness and frequency in order for him to hear reasonably well.
It is the reason to ask if this is necessary for all deaf children (maybe not) to be given cochlear implants? $35,000 per implant (if not for two) isn't cheap, and if the implant doesn't work, that's $35,000 the insurance carrier has to eat.
CI requirements don't always determine whether the person will truly benefit from the implants until after they're put in and activated to see if the choice was worth the trouble or not.
Well, that's the risks you have to take with CI's. All parents and all CI users(if appropriate) are informed of the risks of CI including it not working.
It's their and their parents choice to CI's. Money would be no object if they want their child to hear.