Does Evil Exist ? (To you)

The failure to believe in the existence of evil does not protect you from it.

Do you believe in the existence of evil?

Whether or not you believe in the existence of God in whatever form of reflection He might, or might not, take in your life.   Do you believe in evil?  Is there a Ying -to universal- Yang?   Is there an inherent opposite of intrinsic Good?   Do you believe in a universal struggle between light and dark?
Do you believe in “freewill” from either an evolutionary or theological standpoint?
Why, in the broader sense, is the following statement true:

If you were to write a goal on the top of a piece of paper, then divide the page into two columns, on one side list “reasons I will succeed”, the other side list “reasons I could fail”, why is it easier to fill out the list on the “fail” side of the page?