Well, I've been lurking and watching this thread bubble along for a while now, and I think it's time I put in my $0.02 and go back to lurking.
The OP proposed the high cost of rebuys as a reason for the anti-PvP sentiment, especially in relation to the Distant Worlds and Distant Ganks.
IMO, rebuys have nothing to do with it. Rebuys could be free or credits could even be showered over the PK victims, and it wouldn't change anything. Most people have joined Distant Worlds 2 for the socialisation and even if all the explorers beefed up their ships to survive and escape, the reason for going on Distant Worlds would be literally blown away each time a PvPer entered an instance and started shooting.
Private groups are the only thing that allows an event like Distant Worlds to take place. The only reason Distant Ganks even became a thing is the poor support and functionality Frontier provide for managing private groups. The single person who could add people to the Fleetcomm group was simply overwhelmed in the final week by the literally 1000s of commanders trying to join.
The only point Distant Ganks has made for me is how important it is for Frontier to improve the management of large private groups. It should be possible for a group owner to delegate membership management to one or more other commanders. It should be possible for private groups to become larger than 20,000. It should be easy to search for a commander in order to remove them from the group quickly and easily.
While I like the idea of an "Open PvE" mode, I also don't see it as a realistic possibility. There is no way Frontier would want to take on the workload of dealing with 'troublemakers' in such a mode. It is much easier and more sensible for them to shift the responsibility to private groups. However, by abrogating their responsibility to provide a play mode that their customers clearly want, Frontier should show their appreciation of the people who *are* making that effort by giving them the tools they need to manage the very large groups that have emerged.