I think Interdicting any player is provocative. It surely isn't indicative of benevolence. You could have veered off and saved the one guy from over heating. If I had the option to pick a middle monkey I would have. Your karma should largely stay where it is.
There was literally only a few seconds from his overheating message to going pop. Trust me, if there was time to disengage, I would have. Once all the votes are in, I can adjust my Karma balance accordingly, and plan my next experiment accordingly.
If it helps at all, I did carry out a near-station cargo drop for the only two Cmdrs from about 12 or so in a starport who bothered to respond to my hails, then followed me as I flew backwards away from the same station with promises of riches.
Come to think of it, that probably was a bit creepy.......one of them even messaged with "What the hell, I'll probably get blown up anyway".
He didn't. Neither did his friend.