Swain also displayed a complete ineptness to run a business, which fits in perfectly with the description of a sociopath to hold a job. Also, there are many functioning sociopaths among us, they represent 1% of the population. They are not a rarerity. Most of them do not commit murder, but they do leave a wake of financial destruction without remorse which fits Swain to a "T." Where a murder of a spouse has been proved to have occurred, the spouse responsible exhibits patterns of behavior that is very similar to David's. It is certainly not proof that he killed her. The only value it has is that it makes it possible for the jury to believe that he would be capable of the murder and to disregard the testimony of his supporters who say otherwise.
Dave maybe be a lousy business man although around here dive shops do not do well. The winters are cold and long and not many people dive year round, not enough to keep a dive shop running at a profit. Most dive shops here are ski, snowboarding, etc.. shops. The air compressor is down from Oct. to May in these places. OSS was open for diving services year round. I believe Shelly and Dave were partners in trying to keep the shop going. I don't believe Dave was manipulating Shelly at least in this aspect.
Afterdark has an excellent point. Running a dive shop in New England is not an easy task - especially during the winter. Three dive shops have closed in the state in the last 2 years and 6 have closed in the Providence/southern MA area. One was open for 25 years before closing - David's was open for many, many years before David even met Shelley and for 8 years after her death - until after he was arrested. So apparently he wasn't as bad a businessman as you seem to think. in fact, when he was arrested, he was working behind the counter at OSS.
When Shelley married David and started investing in their business, they added to the shop in a major way - they added an in-ground pool so that they could train divers and kayakers on site. Shelley loved being a part of owning the shop and helped with the plans for the addition. She was very active with David in the plans for the expansion of the business and was by no means "exploited" as a source of funding - it was absolutely voluntary and something that she not only wanted, but was excited about doing.
As as to where some of Shelley's money went after her death, much as it's very fun to think that he squandered all of it on vacations with Mary Basler, that's simply not the case. That in-ground pool was later enclosed (as David and Shelley had wanted to do in the first place, but couldn't afford to at the time) to become an indoor heated pool with a retractable roof so that it could be used for training year-round as well as adding some apartments that were rented to vacationers in the summer. The pool was not only used by the shop for training purposes, but by the community for swimming laps and David allowed it to be used - gratis - for training handicapped divers.
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