There is only one valid reason. That reason would be the "buck stops here" idea.
Look, if your contention is that his performance in recent years has not been up to snuff, and further, you don't feel Richt is capable of getting it back up to snuff, then hey, he's ultimately responsible for his football team. I can see that mentality.
However, there are some real loons out there with some of the most idiotic arguments (I use that word in the loosest way).
Some people contend he is not competitive enough.
After the narrow victory over Mizzou, Richt stated that he told Marshall Morgan he loved him no matter what (i.e, whether he made the winning kick or not). I've actually heard/seen some people make the comment that such an attitude might be part of the problem. Seriously?
Another group of silly suppositions is that Richt should not be "happy" that Georgia beat Missouri. This is such a stupid notion, and yet Richt knew he had to preface his being happy by asking rhetorically, "Am I allowed to be happy?" before stating such. Come on, folks. He's happy Georgia won the dang game. I assure you he's not happy that the offense failed to score a touchdown. Moreover, I promise you that what he says publicly has been and continues to be a far cry from what is said behind closed doors and on the practice field.
The list goes on and on from people who are so uneducated...well, let's call them what they are....dumbasses. There are people who are such dumbasses that they will throw any flavor of the month reason why Richt is apparently a horrible football coach.
"Georgia doesn't know how to tackle!"
"Georgia's receivers don't know how to catch!"
"Georgia doesn't play with enough passion or anger, and that's a reflection of Richt!"
"Georgia is too undisciplined!"
I mean, I realize that there are a lot of people out there, and as such, there are going to be a lot of different, equally moronic opinions.
If you are getting a little angry with some of these statements, then it might be because you've made one or more of them yourself. If so, just take a deep breath and ask yourself some of the following questions.
"Do I really believe that Georgia's assistant coaches are teaching kids how to tackle or catch a football differently than all the other schools out there?"
"Do I really think that all the assistant coaches from all the different schools they've coached at come to Georgia and secretly think to themselves, 'Wow. Mark Richt doesn't seem to care if players don't perform. He doesn't seem to care if players are practicing hard, listening to instruction, and playing with heart?'"
"Do I really believe that Richt is unaware his team seems to have a real letdown game or two every season, which rears its head as either a blowout to a good team, or an inexplicable loss to a lesser team? Further, do I think that he hasn't taken multiple approaches to trying to limit or eliminate these?"
Let me be clear. This is not a rant to quash the "Richt must go" argument. While I won't state my opinion on that matter at this time, I'm not trying to suggest that that particular viewpoint is necessarily unfounded.
Rather, the point of this is to implore the dummies to shut up, and the passionately-misguided to re-examine some of the "reasons" Richt needs to go.
Again, the buck stops with Richt. He's the coach, and if things haven't been working out for whatever reasons, then it rests on him. That's why he makes the big bucks. Just stop making these completely unfounded claims about things of which you have absolutely no knowledge or insight.