Of course, being open and vulnerable will lead us to, sometimes, experience pain. But what is pain? It is simply a feeling. It is not forever. If you get pain from some person or thing too many times, you can always walk away. To risk a lifetime without pleasure simply to avoid pain is ludicrous.
The things that really shake the human soul aren't beauty or kindness. Although such things are certainly moving, but those feelings don't last long. But... anger or sadness are different. They leave an undelible mark. Even after the wound heals... you can never forget the pain completely.