This is a great little article.

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Psychology Today <- Much more in this link.

There is no reward for being vulnerable for any species of life, from one-celled organisms to homo sapiens. Consequences are severe and often swift. On the other hand, it is necessary to create space to experience safety and regenerate. Creatures exposed to sustained threat do not thrive or live as long.

Sustained threat fires up multiple defense mechanisms of the body, including inflammation. These inflammatory cells sensitize the nervous system and physically destroy tissue. There is a higher chance of developing serious diseases, especially in situations where there is little opportunity to find peace and safety.

Why hold onto anger?

It keeps you safe. It protects you from both emotional and physical pain. You are being asked to give up your anger so you can experience anxiety. Raw anxiety is an unpleasant feeling. It is this interaction that may be the root cause of why it is sometimes thought that you cannot really be open to change until you “hit bottom.” In other words, the anxiety is so out of control that it can no longer be contained by either functional or dysfunctional means.

Why be vulnerable?

Why would you ever want to be vulnerable? Because humans have language and social connections that are unique to our species. Being aware and vulnerable is the essence of relationships, and the deeper they are the more necesary these traits. It is an ironic and disturbing aspect of our existence.