Logoffski is low, unsporting, an offense to FD's vision for the game (which is why they plan to do something about it) and something you'll not see me do, because its just freakin' LAME.
Having said that, however, were you pirating (after the cargo not the kill) or planning on killing 'em? Did they have any data to indicate your intentions one way or the other?
If you were pirating, you have the mindless pewpew crowd to thank for this behavior, Traders pulling a logoffski grows in direct proportion to their perception that any other player interdicting them is after their hide, not their cargo. Yes, I know that with that view they should be playing in a mode where they wouldn't have to but in the real world, there will always be a load of 'em that will stay in open and just logoffski when interdicted.
Personally I assume everyone after me is planning on reducing me to space-dust until I find out otherwise. I'll be prepping to fight or run the moment I'm in normal space. Open fire and the fight's on - I'll take you out if I can or do my best to escape if I can't. If I get comms that you want cargo I'll cease fire, and not resume unless negotiations fail or YOU call them off by firing again.
If all that you were after was a cheap kill against an easy target (which a type 6 definitely is, even for the weaker combat ships) then with the greatest respect you are part of the problem because it's folks playing like this that encourages weaker players to logoffski, damaging the game for folks who actually want to play as pirates.