Think about it again in terms of what the parent said in the second paragraph: You, tboyd47, are hired but the employer correctly anticipated during the interview process that you would not be able to succeed but needed a body and you were the closest match. Did you really fail if you never had a chance? That's why he said it was unproductive and unethical.
If I get a job, stay in it for 3 months, and still can't succeed in it, then I would consider that a fair chance no matter what the person really thought of me. Not being given the job at all (and, if they hire like most companies I know, not being given a reason why) would make me feel more like I haven't been given a chance.
