Line the first: Wheaton's Law. (Can't quote it here, but if anyone's ever bored on a long trip, listen to his PAX 2007 speech.)
I'm on my trip back from Sagittarius A*, all in the open, and naturally, that whole event bothered me. Not because of any sense of imminent danger - I'm flying with 4 pips to the shields, armour and some weapons. But we're talking about over two months of my spare time, wedged between work, kids and all the other "real" life stuff so I can pursuit a hobby. Being able to go to Sag A* is the first and foremost reason I bought Elite, and this trip means something to me - it's a test of my patience and my will to persevere, and it did a lot to really sink in the lesson of how awesome and huge our universe is.
To me, it's kind of a sad and pitiful thought to take that whole trip for the sole purpose of destruction and notoriety, it's like visiting the Louvre only to paint a mustache on the Mona Lisa.
Line the second: There is no line for in-game behaviour, but not everything is in-game.
It's easy to forget that the internet (and Elite as a multi-player game is in that regard nothing else but a prettier internet) is a channel of communication between human beings. The game might have no rules for in-game behaviour, but that does not remove the rules that govern human communication. There is a human being on the other side of the screen: You can roleplay a sociopath or an anti-social nihilist
towards his character (and I respect the people who do that a lot, even if they make me feel uneasy), but you can also fall for the trap and act like a sociopath towards her or him directly, and there is a difference. My in-game character lives in a cutthroat galaxy, yeah, but for him it's only been about 30 hours to go to Sag A* and back, he doesn't lose much, except for money. I, on the other hand, would lose two months of personal investment, and everyone who enjoys taking that away doesn't enjoy roleplay, he enjoys hurting the
person on the other side of the screen.
And all the arguments along the lines of "it's only a game", "ain't no rule" that are directed at the victim disregard that the perpetrator doesn't act in-game. He doesn't get credits or exp, he can't even pat himself on the back and say "good roleplay" and be done with it. He does it to ruin another real person's day, and that is neither a game, nor aren't there any rules.
Line the third:
Character is what you are in the dark.
End of line. Jump!