When you look at the case as a whole, there is nothing that makes Swain look good. Almost every piece of information we have about this case makes Swain look bad. He tried to have an affair, so you can't say he was a good husband. He burned through $670K of Shelley's money in three years, so he was not capable of managing money, even a lot of it. Shelley had to support him and his dream, so not only was he not contributing to the marriage, he was a financial drain. Even as a city counselman, he looks crooked. He was a lousy dive buddy, not caring where his wife was at anytime after they separated, even though he was a certified dive instructor. He stopped the radio calls for help. He gave up on CPR and stopped two others from trying. He tried to give her equipment away immediately after the incident - twice. He gave her dog away and got rid of all her personal possessions almost immediately upon his return from BVI. He said a ton of stupid, insensitive things like, "I've seen dead bodies before." He pisses off the judge in the civil case by ignoring her warnings to find another attorney for three years. The mask was severly damaged, along with the missing snorkel mouthpiece, the most damning piece of evidence. The fin sticking into the sand points to Shelley, lying helpless 30 feet away. All this stuff that has to be explained away. There is nothing that makes him look good, nothing. It all looks bad. There is only so much you can explain away before it becomes ridiculous. You have to say, if it looks like a duck and walks like a duck - its a duck.
Being insensitive, stupid, and unable to cope combined with lousy people skills doesn't make you a murderer. With regard to CPR, there are accepted rules that exist mostly for the sake of liability and not for anything related to actually saving lives. Attempting and maintaining CPR on someone who is clearly already dead would be a very hard thing for me to do. If we're talking about a loved one, I think it would be that much harder. Those things may have been allowed to impact the judgment of those involved with determining the outcome of the case, but they aren't proof of a crime.
That said, the evidence in the water has to tell the story. The story it tells is that Swain was likely responsible for the death of his wife. It doesn't guarantee that to have been the case, though. I believe the sane among us have already come to agreement on this point. If there is anything left to discuss, it relates to the process of the trial and the future of appeals until the situation is completely settled.
About the only place I will completely disagree with you is in your characterization of him as a lousy dive buddy. The two descended and separated. If that was the plan, then I don't think you can condemn anyone's buddy skills based solely on the separation. Obviously, a buddy who attacks and kills his partner is a special kind of lousy, but I don't think you were referring to that supposition as much as the admitted fact of separation.
Is there anyone on this thread who can't agree with the following statements?:
The evidence in this case provides significant proof that Swain probably killed his wife. Whether Swain killed his wife or not, there is clearly enough evidence to support a civil verdict against him. While he didn't have proper representation to fight the civil charges, it seems nearly impossible that he could have won such a case by any means other than employing technicalities of the law with the low burden of proof.
However, the proof of his guilt is not absolute, so each person is entitled to their own gut feel for what actually happened. There is significant support, including the actual jury that saw all of the evidence and heard all of the arguments directly, for a verdict of guilty beyond a reasonable doubt that Swain is guilty of murder. That doesn't make it the objective truth. Objectively, it would be hard to argue that the jury is way off base to have convicted based solely on the evidence they saw and assuming no prior personal knowledge of any of the participants.