I actually dislike how blasters used by troops are sometimes not red after the OT. Rebel fighters using red makes them feel like a weaker military force, which is more appropriate than just any colour. The Empire using green turbo lasers made them feel like the top of the line.
Color is very complicated. Green = evil and powerful when used with blasters, but it is not evil when used in lightsabers. Red = weak when used in blasters, but not when used in lightsabers, where it is strong and evil. Perhaps it comes down to the Sci-fi versus the fantasy elements of the universe, and the differing color meanings in these different paradigms.