Rakghouls were the result of
zombie attacks a disease (no, not the Flood) that was found on the surface of Taris. A person or alien infected would transform into a very ugly thing that nobody liked. Contrary to popular belief, they were not trying to eat the flesh of their victims, as they were vegetarians. Actually, the disease made them have a primordial urge to hug everyone in sight. Many people mistook the throngs of rakghouls advancing on them for vicious killers when they were really simply trying to embrace the newcomers and welcome them into the gang. They loved to party and disco, but nobody cared to invite them to the Super Carbonite Rave Party. They went anyway and were killed by Darth Vader (he was a real party-pooper on a grand scale and hated seeing things that looked uglier and meaner than him at the party), which kinda wrapped things up for them... All of them. For now...
Racism and RakghoulsEdit
Most people hated rakghouls because of the way they looked. There were numerous attempts to destroy them, but none succeeded until Darth Vader wiped them out at the Super Carbonite Rave Party. But many failed to realize that rakghouls were not vicious killers, but lovers of peace and partying. This is why so many hippies went to Taris so they could party with them. But nobody could believe such ugly things that foamed at the mouth were very nice (as long as they didn't bite, that is).