Don't know what you talking about. I haven't seen any griefer in ED so far.
To the OP: Even though I am highly into PvP I don't think we shouldn't be able to log out outside of a station. What's with explorers? Logging out within this 15 second time may be an idea. A relog at the insurance screen is just what I want for c-loggers. It may punish those with a bad connection, though. But anyways this shouldn't be an excuse for c-logging.
So to conclude: instant death when logging out in a fight (within the 15 second timer) is something I'd like to see. Don't know what would be so hard to activate the insurance event upon losing connection if some value was set 'true'.
It is indeed a fast way for FD to fix c-logging.
But keep in mind that instancing is the second worst thing in ED so don't mess up instancing and disconnecting