It does not matter whether a thing is good or evil because people don't really care about that unless they, themselves, or the people they truly care about are being directly victimized by it or directly threatened by it.
Case in point, some people glorify, idolize, or lionize mobsters. These are particularly cruel, brutal people. They tend to have their own codes, ethics, and morals, supposedly, but they still do great harm to other people for self-interest. Yet people tend to like with them, side with them, and empathize with them. Some people dream of being them or living their lifestyle. It's not simply about being a criminal, however. Some are wooed by the rewards of the lifestyle while others see something attractive in the character of the person or organization. People value strength, daring, boldness, intellect, cunning, even ruthlessness so long as it's not being used against them. Like Scarface, these virtues can apply to the saint and the sinner.
This seems more true when comparing them to other criminals like pedophiles, rapists, wife-beaters, and child-traffickers? What's the difference between this latter group and the mobsters initially mentioned? The latter prays on the weak. They are, themselves, victims of their own lusts and instincts. They don't act against force or opposition, most of the time, they are swept away in it. Mobsters tend to be people in an under-dog setting who rise up through force, will, cunning, etc, to stand atop a hill or pinnacle of some sort. They fought against the odds and many people empathize with that. Many people idolize the strength and character it takes to fight and succeed, independent of what is being fought.
We lionize things like the Roman Empire or Genghis Khan. What moral justification is there for marching across the world slaughtering people left and right for the sake of money, power, land, politics, or what have you? However, since we are not the direct victims of these agents, we tend to empathize with these actors because they are brave, strong, powerful, or show other aspects of character that matter to us. Morality doesn't matter to us as much. We might easily sit down with a charismatic hit-man and befriend them more than we might a nerdy functionary in a library. So long as we aren't the target of that hit-man. So long as we aren't unduly affected by their actions.
This idea came to me because I realized it in it's fictional context first. That people, these days, would like to be vampires more than they would be afraid of them. If they were assured a vampire would not hurt them, but befriend them- or even more, make them one- they would likely accept this relationship. The evolution of the vampire and werewolf is also significant- going from pure evil and atrocious monster to dazzling icons of intense sexuality and jaw-dropping power. They still do evil, it's just they don't do it to a particular group of people and so they are endured...befriended...betrothed. There's people who would want to be Sherlock Holmes and there's people who would want to be Moriarty. Most kids say they want to live in a fantasy world. Mind you, this fantasy world is one where people are running around killing each other with supernatural powers. I highly doubt they want to be one of the powerless peasants running around screaming either, but they want to be the powerful and the gifted.
To me, morality is another one of those pleasant fictions we adopt and even try to adhere to as people. It's not like people are completely without a sense of morality, or that the moral ideals they consider themselves acting towards have no bearing on their actions. It's not like we couldn't care less if a charismatic maniac went around destroying and killing people. It's that this is not necessarily the case each and every time. It's one thing when these people are strangers. But what if they managed to work their way into your confidence. To get close enough to you that you saw in them virtues stronger than other men or women? And then, after this, they commit these crimes. Maybe your view of right or wrong is different? Maybe the blood-soaked mobster isn't evil, he's just a product of his environment. Maybe the blood-soaked police officer is just over-stressed. The predatory priest is just confused and needs counseling. The vampire is just devoid of human touch and love. No matter how many times a tiger has killed a mice, maybe if it is willing to be friendly, a mice might pull a thorn from it's paw...instead of fleeing away at the god-given opportunity.
I haven't thought too deeply on this enough to say whether I think this attraction distorts morality or whether morality plays no true part in the affair. I know there are times when my family members did things and I supported, defended, or fought for them even when they weren't right because I cared about them more than people I didn't even know and the loss or injury to my own was more important than some stranger or even someone I might have known but didn't care more about. I think, at those times, morals and religion are sort of similar. It's easy to believe you have them when pressure doesn't test their integrity, and when it does, you excuse the fact you dropped them because you were pressured. I come to believe that morality is a sort of delusion we place over ourselves. At least...the surface morality. We, each, do have things we consider right and wrong, good or bad, ideal, tolerable, or reprehensible. But those things that are personally generated are not likely to match evenly with societies. This can be a good thing, but as the Scarface example might signify, it's important to realize that even though moral ideals do affect society and influence behavior, you are always dealing with an individual- especially when pressured- and their true morality is revealed when they have no time or room to consider they external morals they've spent their lives trying to adhere to. When personal instinct overshadows the rational mind and it's ideals. But it's also to say even with our conscious morality, our personal, truer instincts still affect society and push it in ways that may steer us for better or worse.