Here’s another wrench for ya. George argues that Han shooting second makes him like a cowboy. Well there is a factor in this that George leaves out. Han is already shown drawing his weapon moments before the actual kill. In Westerns it’s typical for the shooter to draw at more less the exact second of the kill. Han wouldn’t be drawing his weapon at all if he had no intention to kill Greedo.
And for me Gary Kurtz put it perfectly. (paraphrasing) “Han had to kill Greedo or he would lose his life”.