Kind of like Gantoris having a purple lightsaber in KJA trilogy.
And everyone hates KJA.
Lucas expressly stated that the good guys only have green or blue, and that the bad guys are red only.
I remember Kotor had 3 colors and they were by class like an RPG thing. the only one besides blue and green was yellow.
Kotor II allowed your past lightsaber and lightsaber build to be multiple colors but in both Kotor I and II red is pretty much a Sith color.