He's not evil, he's just being portrayed as evil by the establishment.
He's the one who "tricked" us into eating the apple and freeing us from being the mindslaves to God.
He's killed less than a dozen people. God has killed off the entire planet at least once. He was even a dick and knew Lot's wife was going to look at the cluster-blam!-ing of Sodom and Gramorha, told her not to, and turned her into a pillar of salt anyways when she did.
I mean when you get right down to it: Satan is the good guy compared to God.
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Well of course he looks like the nice guy. That's the point. He's appealing. It's easy to be a worshipper of Satan. It's hard being Holy. Stay sinful plebs