Can science be helpful in preventing people from committing suicide?

The loss of my younger sister committing suicide 7 years back was shattering. She was only thirty years old. I somehow consider it as a failure of science to save her, not just her, but million others who lost their lives before and after her. Considering the mysteries of brain chemistry and its convergence with the experience of life, could science not interpret what is the main drive behind someone’s decision to die? Could it not help in pred....