I'm not entirely clear myself on the exact breakdown of truth vs. sarcasm in the preceding paragraph.
Please don't take that the wrong way, I've got nothing against you personally (I've read some good posts from you, IIRC), or even with that particular post - it's just the straw that broke the camel's back. I just read a large thread on programmers.stackexchange asking whether IT job requirements are customarily exxagerated, and the answers were distressing. Firstly because most replies painted a bleak picture of HR practices, but secondly because most had a jaded, cynical tone which made it impossible to guage the sincerity. Or whether all the upvotes were from genuine empathy/agreement, or just amusement at the sarcasm. It gets really unclear.
It's like having two angels on your shoulders, one saying 'these sagacious persons have just offered a terrific insight, you must act upon it,' and the other saying 'these people are just trying to sound cool, of course the real world doesn't work like that - ignore them.'
/rant
However, I did wimp out once when a student begged me to increase their grade from a D to a C because they needed a minimum GPA to play football. My thought at the time was, "This guy is a prick, but he has absolutely no future in the life of the mind, and college football is probably his only chance at success in life." It was something of a split-second decision, and I still regret it. Upon further reflection I realized it was completely unfair to the other students in the class, and swore never to do it again under any circumstances.
I'm not going into any more detail than that. I'm sure you didn't mean any harm by it, but it creeps me out a little when internet strangers start asking for information about how I could hypothetically be sued. I'm not a lawyer, and I'd rather not be surprised to discover there was some wacky clause of a law I wasn't aware of.
After class, the (usually slightly terrified) student would go and talk to him -- and this guy, bless his heart, would do his best to figure out what the problem was, and how to get that student back on track. It worked, too. For a lot of students who get demoralized and let their studies slip, it's enough just to know that someone in charge cares about them, personally.
Ever since then, I've always thought that was how it should be. Grade adjustment is a pretty sad substitute.