As long as we’re coming up with overly convoluted reasons that a minor plot device from a fantasy space opera makes sense in a rigorous scientific way, why not assume that they were genetically engineered specifically as a torturous punishment for the Hutt syndicate? Bioengineering is apparently canon, so there’s in-universe justification.
Never dehumanize fascists or fascist-sympathizers (redundant but ok), it’s always important to remember that bad faith actors or their stooges are human and cannot be entirely eliminated from society, which is why people that fight for positive change have to set the rules such that bad faith actors’ actions are either quickly recognized and mitigated, or have society structured such that even those motivated solely by unempathetic selfishness can only achieve status by masking and contributing positively anyway.