Probably one of the primary storylines to weave its way through the entire Star Wars universe and canon is the rise and fall of the Empire. Remember, the Empire came to power because the Supreme Chancellor Palpatine controlled the strings in the background. He was disappointed in the lack of recognition of the Sith. Eventually, He created a plan to destroy them using Anakin Skywalker as bait.
Color originates from the Kyber crystal used at the core of the lightsaber. These rare crystals determine the overall color when the fighter holding the weapon's personality, fighting style, and moral choices are blended together. The only exception is red crystals. These are synthetic. That is why you see so many Sith with red-colored lightsabers. All the other crystals are found in nature.