I didn't have to think about it very long, and my answer spilled out almost spontaneously. I'm a bottom-line, big-picture thinker, and my answer reflects that. Let me know what you think.
It’s okay to cry, and to say so
Why is it not only okay, but essential, that you tell your kids it’s okay to cry? In the most simplistic terms, if I am crying, and it’s not okay to cry, then I am not okay. There is something wrong with me, with how I feel, with expressing those feelings with tears, with having feelings at all. These beliefs can stunt a child emotionally for life, and severely inhibit the richness and reward of all experiences and relationships. Telling a child it is not okay to cry is the opposite of acceptance and unconditional love, two things all people need to thrive.