How does leadership become toxic?

After reading Chapter 14, Exploring Destructive Leadership, fully respond, with at least 3-5 sentences each, to the discussion questions presented below.
In your replies to classmates (at least two, and more, if you wish), I do not expect to see simple replies, such as "Yes, I agree with you." Remember, the intent of the online discussions is to generate sincere and relevant dialogue between you and your classmates on the topics presented.
Discussion Questions:

  1. How does leadership become toxic?
  2. How can people guard against becoming susceptible to destructive leadership?