yes it would be nice if that situation you descibe was allowed .. but in reality it isnt .
in a murder case I have personal experience of the assused and the family although wanting to deny the charges at their most vocal were told by the defence not to do so ..just to act in the same way as VT is doing . to the extent they were advised not to place his alibi witness on the stand!!!!
result ....life sentence ...18 years min
Personal experience here too, though not involving murder this time and the person in question in my case was adamant he wasn't guilty.
Come the trial and on the day an hour before the trial was due to start they pushed him heavily to go guilty. The lure was that the judge had indicated he'd get 5-7 years for a guilty plea...and 8-10 years for a not guilty plea.
Still protesting his innocence he ended up going guilty...and got 10 years!
For six years from when he was sentenced he still proclaimed his innocence. Months before his parole date he finally admitted he
did do the crime, not quite as it had been described in court, but did it he did.
For seven long years family and friends stood by him, proclaiming far and wide to anyone whenever the topic cropped up that he was an innocent man. Let's just say it came as rather a shock when after all that time one day he said "erm I've err got something to tell you...".
...which is why I for one take not a blind bit of notice of what the family states. Of course they believe he's innocent - that's what he's told them...and maybe he's telling them the truth..and maybe he is not. The shame can be just too great for someone to admit what they've done to the people close to them who they love.
On the other hand I once knew another man who served 19 years of a life sentence for a murder he said he didn't commit. He was eventually released on appeal about 11/12 years ago. His family left him to rot, and by the time he came out most of his family had died. It's a hellish predicament and situation to be in, wrongly accused and sentenced for any crime let alone murder and, since rarely are there any eye witnesses to many crimes, it does make you think how being in the wrong place/wrong time or right place with no alibi can put someone in such a position as this.