Han never shot first (he just shot) and it made perfect sense and looked natural.
It made the character feel both realistic (within the fictional world) and plugged the scene into memories of watching countless westerns on television (usually with a roast dinner on my lap).
I was seven years old but once again two real looking suns setting in the same sky really sold the location as being in the same sort of place that Westerns and Biblical epics existed in but also as an alien planet where anything could happen.
People make fun about Frink's mom because they are jealous.