HR personnel can burn in hell, as far as I’m concerned.
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And if you think your interviewer doesn’t get that from you and your body language, you’re kidding yourself. There’s a pretty wide gulf between self assured and arrogant. Evaluating the best fit for the job absolutely includes attitude. I’ve shown my share of hotshots the door for just that reason. Because I know I have an interview later that day with someone just as strong. Thank God I don’t do that job anymore.
But you’re absolutely right that under and over qualified people should not be brought in for time wasting interviews.
Fortunately, I've had a few good things fall for me the past four years. When my current contract ends in November, I'll have only the mortgage and utilities to worry about, as my other debts will have been paid off.
Your points are well taken. We all should strive to be more self assured than arrogant.