Everyone has their own views on morality, you just can't reasonably apply your own to other people.
Everyone has their own views about everything, but that doesn't make them valuable or correct.
It is the only reason because it's your underlying justification for all your other arguments.
It's actually not, but you ignored the other reasons. A smart move if you're trying to avoid them.
How was it not common sense among the slave owners?
So what you're saying that people who "simply do not see leaving the game early as a moral issue" are the equivalent of slave owners. Well, ok, I guess.
Common belief is the definition of common sense.
No, it isn't. If you were a slave owner, would you have liked to be a slave? No? Why not? Common sense. Would you like someone to leave your Demigod game, ruining it? No? Why not? Common sense.
Common sense changes over time and simply cannot be used as a criteria for absolute morality.
No it doesn't. It just takes a small amount of thought to understand the consequences of an action.
You missed the part about how I try to play organized games to avoid it.
Why are you avoiding it if you have no problem with it?
Only bothered to try it once but it worked quite well. There were no ragequits that game and the people in the game responded just as politely as I approached them.
I'm fairly sure you didn't make a difference though. Those people were not going to quit before your speech. You didn't convert anyone, because these people are not convertable.