Poor grades are supposed to be for poor work. What you're talking about is intentionally giving good students bad grades for good work just to piss them off, hoping that something good comes out of pissing them off. That's not what grades are for.
I.e. capriciously, arbitrarily, and often based on a random person's mood at some random time?
Many different groups have mutually conflicting expectations about what grades are supposed to be for. But one thing I think students, teachers, and prospective employers would agree on is that they should be rooted in some measure of performance or ability. Otherwise they serve no socially beneficial purpose at all. What is the point in taking a calculus exam if you'll just get 0/100 because the professor doesn't like your handwriting?