They train hard, probably as hard as any group out there, and train in dangerous activities. These are the risks,
and as a jumper I don't see how you can find any "sinister motive" going on with this accident.
They fold their own chutes, and gear just doesn't fail like it used to with the old gear jumping rounds. If jumpers go in these days, it's because the jumper made a mistake, not the gear going bad, or someone trying to "do them in".
Plus trying to sabotage someone's jumping gear, it's pretty easy to spot anything that would actually do them harm after the fact, so it would be well know shortly after the accident. Alot easier ways to do something in then to try and induce a skydiving malfunction. Hell, make them jump enough and it will happen, the stats speak for themselves.