All this recent talk about Disney buying Star Wars (and everything else LucasFilm related) got me to thinking...
Back around 1997 George Lucas decided that Han shooting Greedo first was a Bad Thing. He claimed it made Solo look like a cold-blooded killer. He felt so strongly about this that when he released the Special Editions he changed the scene so that Greedo fired first (and missed!!!) and then Solo shot him. Phew! Thank goodness! Now he's only guilty of voluntary manslaughter (alienslaughter?) instead of murder.
Curiously, when placed in a similar situation Indiana Jones guns down a threatening swordsman and George is apparently OK with that. In fact the Swordsman's murder is treated as high comedy.
So for the record, shooting an alien first is bad and must be excised from the public's memory. Shooting a sword-weilding guard-- Com-O-Dee Gold!