The past few days I've been working on a war to maintain a faction I put in control of a system, in control. I was in a wing of four with some PvP buddies that help me out with combat stuff, we entered a High CZ & there was already a player in the scenario on the opposing side, it was nearly complete.
I did my go-to move in these situations, which is to hail them with an 'o7 Cmdr

' and put my ship in their line of fire to make sure they are situationally aware, and to see how they react (ie will they fire on me, leave, or communicate. I always prefer a diplomatic solution).
The player returned my o7 and accepted my friend request but turned & moved off, continuing to kill NPCs. I said to the wing we should just try to win the scenario. We didn't, it was too far gone to pull back.
We remained, me & another continuing to kill enemy NPCs (for massacre mission count, making the best of a bad situation) but the other two started harrassing the opposing player, trying to goad them into fighting back or leaving. The player logged off and went to solo, presumably to continue fighting. I said to my wing that I wanted to find out this players motivation - whether they were an opposing BGSer or just a random player ranking up or whatever.
We docked for resupply and I contacted this player (because fortunately he was now on my friend list) to try to establish why he was fighting in this system, and why he had chosen that faction. And why he hadn't just jumped out too I guess.
I managed to establish that they were getting bonds for an engineer unlock and that they thought they had to get bonds for the particular superpower that faction was aligned with. I persuaded them to help our side, and through some instancing shenanigans got them into the wing with my buddies & I left the wing to do some other stuff (I was the weakest at combat in the wing).
This is how I play. It's how I 'PvP'. It's rare, but meaningful. That player should have jumped away or accepted their fate, as I have done on previous occasions, but they didn't. Their saving grace was that they accepted my friend request.