I am from the South. Here, we have an expression "he reached the end of his tether", meaning someone has just had ENOUGH. I think whoever killed these people had reached the end of his tether.
A definite possibility. In support of that, there could be alot of people "holding tethers":
- One victim was involved in "BWI" accident leading to the death of another person. Furthermore, the victim's personality appears to have been capable of alienating other people apart from the boating accident.
- Two generations of the family were / are involved in a large scale "Sue'em" law firm. In addition to targeting large companies, the Sue'em firm also targeted a good number of local individuals.
- One member of the family might serve, or had served as either an active or "reserve" criminal prosecutor. Perhaps he prosecuted someone for the same offense that his son tried to evade?
- An associate of a family member was killed under strange circumstances. The death and possible obstructions of justice are being re-investigated by state authorities.
- An employee was recently fired. This termination would have led to an eviction as well as lost wages.
- Another employee had died following an accident at work.
- Then, add in the possibility of unknown fence line disputes with neighbors, confrontations over this and that-with multiple properties and perhaps multiple type A personalities as a source for the possibly angry neighbors.