They were all the targets, i suggest, this guy was buying secrets from the other and they were lets say “negotiations ended”. Bit of a coincidence all these industry connected people in one place at the same time.......no such thing as coincidence.
Certainly not when you've got a bunch of dead bodies.
I think the most relevant issue is the surviving “badly beaten” 7 year old girl.
If you are eliminating witnesses and you have just shot three adults, it doesn’t sound logical that you would take the time to try to beat a 7 year old girl to death. Unless, of course, you get off on that kind of thing.
While poorly written, it also sounds like the beaten girl was found in the car. Nobody sets out to do a beating in a car. Too cramped. It sounds more like the beating took place outside the car, for whatever reason, and then the family was forced into the car and shot.