I dono, as a "brown" person, I personally never took this as them trying to say people with brown skin are evil. I always thought the darker skinned evil guys looked badass and "edgy-er". Like evil ken and ryu, they look cool as fuck to me. I think most games want to make their evil characters look "cool" and "edgy" in a way, and a darker color pallete adds to that, from the clothes to the skin tone. I feel like that's the sentiment when coming up with the skin tones, not that they think I'm an asshole lol.