How much emotion is actually necessary? If we are secure with our selves, calm, and tame our tempers, some of us can be the coolest cats alive. If we understand things, then often we don't fear them.

How much emotion do you think is "actually necessary to be human", (as in must have), as opposed to being insecure or uncomfortable about something, or lacking the proper communication skills to address your feelings and the way you are treated, want to be treated, etc etc.

With room for improvement, to evolve, how much emotion do you think is actually necessary and how much of it has a naive and child like nature where we just haven't evolved mentally beyond that point yet?