good - that which is morally right; righteousness.
"a mysterious balance of good and evil"
synonyms: virtue, righteousness, goodness, morality, integrity, rectitude; More
antonyms: wickedness
Evil - profound immorality, wickedness, and depravity, esp. when regarded as a supernatural force.
"the world is stalked by relentless evil"
synonyms: wickedness, bad, badness, wrongdoing, sin, ill, immorality, vice, iniquity, degeneracy, corruption, depravity, villainy, nefariousness, malevolence; More
a manifestation of this, esp. in people's actions.
plural noun: evils
"the evil that took place last Thursday"
synonyms: abomination, atrocity, obscenity, outrage, enormity, crime, monstrosity, barbarity More
something that is harmful or undesirable.
"sexism, racism, and all other unpleasant social evils"
synonyms: harm, pain, misery, sorrow, suffering, trouble, disaster, misfortune, catastrophe, affliction, woe, hardship More
Inherent - existing in something as a permanent, essential, or characteristic attribute.
"any form of mountaineering has its inherent dangers"
synonyms: intrinsic, innate, immanent, built-in, indwelling, inborn, ingrained, deep-rooted; More
antonyms: acquired
I believe that people have both good and evil within them, no one is exempt from one or the other. The subject of the matter is whether or not the two are inherent within human beings. When a human is first born into the world they are considered "free" or given the "blank slate", but I concur with this. Children are born right into various circumstances that could shape their view of the world and themselves from day 1 out of utero.
Birth defects, socioeconomic status (are the child's parents poor, rich, are they living in foster care), cognitive limitations due to mental retardation or other such disabilities, society laws, rules, perceptions, culture, education as the child grows up... There is so much at play that can shape an infant/child's life that they may have a "blank slate" but the underlying blueprint is there even when we can't see it. There was even once a time that children born were considered cursed for things such as birth marks that were obscure or born as twins. A more common curse is if the child is cursed at for being born out of wedlock or to another father through adultery.
The biggest idea to consider is what are they taught or experience with learning about good and evil and what do they personally choose. When we are young we see and/or experience the two first hand. Between the light of good and the darkness of evil, change is the grey. Even though we are shaped through our experience, it is what we choose to do with them that makes us who we are; defines us as a human.
To sum all of this up: I do not believe we are inherently good or evil. There's too much we don't know or at least give credit to that can shape how we view ourselves, other, and life as a whole. We hope to be given a blank slate when we are born, but sometimes this can't be helped for society and other's play a factor in what kind of slate we get. The most important thing to look as is the one ability that is very precious above all else;
the ability to change