The ego is just a term for self-concept. The ego is your concept of who and what you are..
Your self concept should be as positive as possible. A positive self-concept creates positive experiences. A negative self-concept creates negative experiences.
Ego consciousness is dependent on a sense of existing separately from everything else. Ego consciousness is a product of separation from our interconnectedness.
Your ego consciousness is not negative or positive, but separation from inner knowledge and all that goes with that can be overdone. When separation is overdone the results can be dangerous.
The danger of illusion
When we lose contact with the inner self we can be duped by myths. When we are immersed in cultural myths we can adopt the views of materialism, Darwinism and other faulty derogatory paradigms.
When this happens we may falsely justify cruelty to ourselves and others because we think human nature is bad. An inner judge can develop which some people call authoritarianism, but which in my book The Solution, I call the parasite. Whatever you call it, it is an aspect of yourself that caps the good you can accept in your life. It also causes people to become hard and cruel later in life.