The most commonly recognized evil is being indifferent to others' suffering. You are expected to not cause harm, and if it can't be avoided for some reason recognized as legitimate (such as self-defense), you are expected to minimize it. Most game characters I've met express their evil by not recognizing the limits of the suffering they can legitimately cause by their actions.
But as the list shows, things are considerably more complex and evil characters can be interesting in rather different ways.
Which as I said...to the person who lived on the streets and literally nobody cared about who may have been perhaps hours from death...is he "evil" for being indifferent to the suffering of those who didn't care about his? Maybe he was robbed in broad daylight of his last coin and food and nobody cared. He might quite a lot of anger at being "expected" to minimize the suffering by those indifferent to his...he might look at those scales for balancing what's good vs. evil and assess the entire city as evil. Who could such a character "legitimately owe loyalty" to? The only ones who took him in and cared for him were the Sharrans. And if we bring in showing fairness in trade, where does that line get cut off? Is making a profit evil? Maybe seeking to make too much profit but where do we draw that line? A lot of traders seek to maximize profits...where does that stop being fair? As for respecting legitimate authority, that is easily corruptible...sometimes the authority serves only to serve a major business, or worse, criminal groups like mafias or cults of evil deities. Would undermining that authority be evil?
I think these seemingly simple balances are nowhere near as simple as they seem on the surface. The world can be a VERY cruel place. There are people who are raised in areas where crime is the norm and law enforcement is minimal...then add all sorts of powerful magic at play further complicating things. The world(especially that of D&D) is an infinitely more complex place that can't be put in a neat little box of this is how we define good and evil.
