Avbug, I have always tried to post as if I was talking to the person face to face even if I didn't agree with them.
So do I. You don't get any different treatment than if were were having the same conversation face to face, except I'm possibly a little nicer, here.
Lets say, though, you are flying along VFR at 4500 feet, in class E airspace, enjoying the day, not talking to anyone when a jumper descends directly in front of you. There is nothing that you can do to avoid hitting him, and you do, killing him. You land ASAP and report what happened. Should you be prosecuted for that?
If you are fulfilling your duties as pilot in command, probably not. However, the specific circumstances of the situation should be examined. Just as an unintentional death on a motorway or any other place may still result in charges of negligence, manslaughter, and even homicide...the same may be applied equally to a similiar act in the air.
If upon investigation, for example, a discovery is made that the pilot has missed several radio calls during the course of the flight, a zelous prosecutor might make the case that the pilot was inattentive and therefore neglegent. Is he really negligent or inattentive? I certainly can't say; only one investigating the situation in real-time could make the call.
Conversely, if the skydiver strikes the airplane or it occurs the other way around and everybody is fulfilling their obligations and duties to see and avoid, talk, check NOTAMs, etc, then I imagine the only issues that might arise would be civil. Again, it's purely speculation as to what might occur...we can only address actual situations in this case to determine what course will be followed. In the case in question, apparently criminal charges are the order of the day.
If you're asking if I think a random accident constitutes a criminal act, no, of course I do not. However, a great many circumstances need to be considered. In this case, I think it's fairly easy to see the logic in at least considering charges against the individual in question, owing to the fact that he was not in the right place, doing the right thing, and the special consideration that the deceased was in the air because the pilot put him there.