Another thing that concerns me is why is the brain so weak it wants to end its own life? Please don't talk about personal thoughts of suicide as its against forum rules. But I have known other people who have wanted to die. Why? Are there any incidences of animals who kill themselves? I heard there are 50 people a day killing themselves in India right now.
I will concede emotions are beneficial to us. It could be because of emotions we have created wonderful works of art, and even some of our great scientists and engineers could have been motivated by emotions (we don't think of scientists as emotional, but they could have ambition caused by emotions). But with every good side, there is a bad side.