It's not that humans are inherently evil, it's more like that each & every person, even the most virtuous one, has the potential of backsliding into being evil. Take a look into your mind's corrupt part. What is it that you really desire or get thrilled by? Imagine: regularly having entertainments & pleasures of whatever types you dig; having a wealth amounting to hundreds millions (or even billions) of dollars at your disposal; being in the position of giving requests & orders, having those around you who'd obediently satisfy them, having loyalists who'd put those disobeying or rebelling in their place either by legal means or forcible ones; being in the position of projecting & enforcing your will, views, ideas upon masses.
Imagined? Now say neither of the mentioned sounds tempting to you, that you aren't interested in any of such stuff. I wouldn't believe a person rejecting those temptations wholly [holy] or claiming they aren't interested in any of those. Such a person is either an ashamed liar or a madman. I, as well as some other individuals thinking alike, believe each & every human is corruptible, hence, keeping in mind that appetite comes during the consumption process, each & everyone has the potential of turning into an archvillain, under circumstances being favorable to that, of course.
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