In the absence of conscious beings with free will, morality can not exist. Picture a universe of infinite violence such as our own with no sentient life.
I believe that I am merely a "program" and that similar programs run every animal and living thing on earth.
Pavlov's dog aside we do not expect, largely, to change the nature or behavior of an animal. Why should we expect to change our own?
We can expect limited success in our endeavours to change but some change is better than none. We may be able to tip the balance in our favour.
What possible use is hindsight when the past is behind us and unchangeable?
Evil cannot exist without consciousness and free will.
Depression can only be defeated by science and rational enquiry not airy faerie emotional wallowing such as is to be found in most useless self help books.
Depression and determinism: can we influence our moods, can we "change our mind"?