Well, there were several tough roads for the prosecution in this case:
1) Couldn't use prior recklessness with weapons in the trial (of course, this is my biggest problem with this case -- Williams has obviously shown that he has problems being responsible with a weapon and if that evidence is allowed, he is convicted of reckless homicide or manslaughter, IMO). Why did Williams try to hide the whole thing in the first place -- because of his PREVIOUS conviction (which he was sure would be held against him).
2) For some reason, the gun testimony was all thrown out -- simply because the prosecution couldn't guarantee that there was no way the gun could have misfired. Umm, a) guns shouldn't be left loaded in the house; B) guns should never be pointed at someone UNLESS you are protecting yourself or you are an officer upholding the law; and c) guns and alcohol should NEVER be mixed.
For those reasons, Williams is getting off far easier than he should -- and it's a travesty to the family of his chauffeur. The family WILL get a ton of money from Williams -- and I DO mean a ton -- but that hardly gives them back their loved one.