Hopefully, more of the several thousand at that show will become curious and look into the case.

You asked, "Why is the recantation of seven witnesses something the State of Georgia is prepared to ignore? "

I don't see an answer to that question.

Is it an overzealous prosecutor with political ambitions?
A corrupt judge?
A timid governor?
Hate and indifference?
A society that tolerates slaughter to its' children and the children of others as its' foreign policy?

I don't see the answer.
Why are the recanted testimonies being ignored?

For that reason, I am not surprised that he has been unable to get a court to overturn his conviction.  But, that is where whoever the state gives the clemency power is supposed to come in.  They are supposed to look at everything and be the last failsafe to ensure that an innocent should not be executed.  Supreme Court opinions upholding the limits of court review even of claims of actual innocence talk about that all the time.  They talk about how it is okay if the courts use procedural rules and an interpretation of the Constitution that says it is not unconstitutional to execute an innocent person (Scalia!) because there is always executive clemency to catch the cases of actual innocence that fall through the procedural cracks of the courts.  Of course, the problem you often have with clemency boards and governors these days is that, for political reasons, they don't want to be the one to commute a sentence or grant clemency, so you will often hear them say that they are denying any clemency because the "courts have already rejected these claims" or "this case has been reviewed [some large number] different times and has always been upheld; [umpteen] number of judges, and 12 jurors have approved the execution," etc.  So, they both point fingers at each other, and, in the end, it ends up being no one's responsibility when an innocent man is executed.

IF Davis didn't do it (which I do not believe any more than I believe Jamal and Kevin Cooper's innocence), why did he flee?  

Why did he admit to a friend that he had been involved in an argument at the Burger King (near the shooting) and had struck someone with a gun?  In that argument, the allegation was that he had pistol-whipped Larry Young, a homeless man just prior to shooting MacPhail who responded to Young's cry for help.

If Troy Davis had not pistol-whipped Larry Young over a beer, the subsequent shooting of MacPhail would not have occurred.  

Nearly two decades have passed since Davis shot this police officer.  Cooper professes his innocence as well, receiving Amnesty International's assistance along with so many other groups.  The additional testing he received (decades later as well) SEALED THE FILE on his case proving NOT his innocence, but further demonstrating his evil and his guilt.  

I would not throw out the baby with the bath water, but cases like Davis, Jamal and Cooper are illustrative that groups that oppose the death penalty under ANY circumstances are not really interested in providing any sense of true justice for victims of crime.  

Even if Davis' case were crystal clear, there would still be thousands of people lined up against the death penalty's application on the principle of it, regardless of the victims and circumstances.  This is disingenous at best.