//The damage has been done, surely no one would consider employing him now.//
But you have to remember, Mr Giggs lives on Planet Football.
//…well it is when the CPS clearly haven't got the evidence to convince a jury but go ahead anyway.//
In England & Wales the conviction rate for jury (i.e. Crown Court) trials is around 80%. For trials in the Magistrates’ Court it is a little higher at around 85%. What you have to remember, Tora, is that very often, particularly in domestic violence cases, the evidence is simply “she said [he hit me], he said [I didn’t]’.”
I haven’t followed this particular case in any detail but I would be surprised if the evidence amounted to much more than that (apart from Saint Ferguson saying what a fine fellow Mr Giggs is). The CPS has a policy of taking such matters to trial to let a jury decide whom they believe, and they are quite robust with this, doing so wherever possible even if the alleged victim does not support a prosecution. This lack of support often comes after she (usually, but it is a "he" in about 20% of cases) wants the full might of the law brought down on her alleged assailant when she stands (or lies) bleeding and bruised, having had seven bells knocked out of her for the umpteenth time. But a couple of days later she seeks to withdraw her allegations, having decided that “he loves me really.”
So the CPS is caught between a rock and a hard place. If they allow allegations such as those made against Mr Giggs to go without action they will stand accused of bowing to bullies. If they take action and it fails, they stand accused of incompetence.
The bar for securing a criminal conviction is, quite rightly, set extremely high. Any benefit of the doubt must go to the defendant and the jury cannot convict unless they are sure. There will always be acquittals in criminal trials because there are always two versions of events put to the court. I happen to believe that jury trials are about as good a tribunal as you can get and just because there are acquittals, that does not mean that either the CPS or the jury system has failed.