Macbeth, being a worrier and all knows that's it's eat or be eaten, just like the wolf he does whatever he has to do to provide more opportunity for him and his bloodline, for example he knows he will become king so he feels like it's his fate to assasinate the king and obtain his rightful throne but becoming king doesn't only benefit him, it benifits his wife as well as future generations. Macbeth, like the wolf, are very intelligent. All of Macbeths actions have a reason as to why he's done them. Macbeth (for the most part) understands cause and effect. And during the story Ambition drives Macbeth to kill the king and others to achieve his goal. Although it's a small 2-person pack, him and his wife, they are behind one another on rashful decisions the two conclude, and when the time comes for something crazy they support each other.