The reason one should not be shackled is because some may presume the prisoner guilty or may imply the prisoner may be a threat, this obviously can taint the jury. With this point I agree.
In Casey Anthony's case it may also have been to save her anymore embarrassment and injury as she seems unable to wear them without losing equilibrium, crashing to the floor and chipping a tooth requiring dental repair.
If Casey Anthony needs to speak with her attorney she just needs to indicate that at some point during the proceeding and her Attorney will arrange it, if he wants to, or needs to.
Unfortunately the defendant continually plucks at, pokes, touches and flirts with both her male attorneys they have yet to get this behavior under control, she has also slapped JB's arm and tried to get his attention while at the podium.
I could go on but you get my meaning, she is the embarrassment in the courtroom and her rights far from being impinged upon are indulged to an extreme degree.
The vast majority aren't sitting here hoping Casey gets karma bombed in some way just to indulge our need for revenge. Most respectfully, I find your own judgment to be over harsh and a little critical. All most people want is justice for Calyee who amidst all the brouhaha is almost always forgotten.