Do you think ambition has an inherently evil side to it?

My English class recently read Macbeth, and for those who haven’t read it (spoilers!), it tells the story of a hero who became ambitious and committed murder as a result.

Now think of it in your own life. For whatever you strive at becoming, do you think you have a little evil side? Or perhaps ambition can cause someone to become evil? In order to get ahead of others, do you contemplate taking out the competition to do it, rather than entirely achieving it through your own honest work and/or perseverence?