^^^^THIS^^^^ is why he should be found guilty and why self defense is a no-go argument. Don't want none, don't start none.
But I also think Oulsen's bad manners contributed to his own death. Good manners are free, easy to use and can save your life.
While I agree that he could have been more polite/courteous, I still have trouble with that turning into a death sentence. I believe the guy with the gun felt empowered and decided to act rashly because he knew he had the upper hand. Some on FR (not you - the usual "cops and legally armed citizens can do no wrong" types) seem to think that killing the dude for bad manners is justified - I certainly don't want them at my side if SHTF; they're likely to do some stupid "because I can" killing.