> > What about killing red? If killing orange doesn't turn you. Is killing red frowned upon?
> 
> Why would you think killing red would be frowned upon? Sure you'd still be killing a human, but that human had killed other humans. 
> 
> In other words, I doubt it. 

Bare in mind that its hard to differentiate between red and orange players [(both have orange cursors)](http://swordartonline.wikia.com/wiki/Color_Cursor). If you're seen killing any other player it looks bad. Of course it depends mostly on an individuals moral beliefs. For example I don't believe in capital punishment but I'm sure a few of you might do.