Evil is a harsh word that can describe someone who is not doing the right thing, and not abiding by particular morals (assuming we all agree on what is "right" and that we have similar morals). Evil people are considered dishonorable, corrupt, and wrong, but people are not just born "evil"... people who are labeled evil have their own reasons for choosing that path, whether it was out of curiosity, internal pressures and wants, or external pressures. The picture below is a humorous example of this. Someone seeing this photo would be curious of how good the cookies are on the dark side (because I mean, who doesn't like cookies). The viewer would have the internal want of wishing they had a cookie, and the external pressures would be Darth Vader, who is luring the viewer into the dark side by eating one of the cookies.
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| http://www.animationshops.com/images/animationshops/product/large/SW54-DVCOOK_1.jpg |
In the case of Macbeth, I think that his first step "down the primrose path to the everlasting bonfire" (Macbeth, 2.3) was when he committed his first murder of Duncan. But, this murder was not just a spontaneous action to gain the internal pleasure of power. Macbeth was greatly influenced by the prophecy told to him by the three witches. Once Macbeth made the decision to take the path of evil to follow the prophecy told to him, he began facing internal consequences. He was constantly paranoid, and at first he couldn't even, "...say 'Amen,' when [two men] did say 'God bless us!'" (Macbeth 2.2). As the play progressed further, Macbeth fell deeper into this "evil" character, he reached point of no return. "...All causes shall give way: I am in blood stepp'd in so far that, should I wade no more, returning were as tedious as go o'er..." (Macbeth 3.4). Macbeth realizes that if he goes back from this evil, life would be just as hard as if he kept moving forwards on his evil path. He realizes that the only way to keep his power now is by threatening and killing those who stand in his way.
Everyday people choose evil for different reasons, but they did not start out their life as evil. How long a person stays on their evil path influences the extent of their evil actions, and affects how large the consequences are for them. Evil shouldn't be the path that people feel they need to take to get what they want in life, but it is always around us in many different forms.