There are two sides of a coin and similarly, every sad story can be taken in two ways, in both optimistic and pessimistic ways. We are habituated by listening to the phrase which says broken glass can never be fixed. This is a very old pessimistic approach for sadness which lets a person drown deep in the lake of tragedy and suffocate. This doesn't mean people should take every sad story in an optimistic and try to feel happy about it. That's completely ridiculous. Do you know a person can carry the sadness for the betterment of one's personality?
Have you observed a building with glass windows that shine gorgeously under the sun? And let the sun shower its rays on shattered glass? Compare the shine. The polished shine always gets dominated by the glittery shine of shattered glass. Of course, that broken glass can never be fixed but still, it shines better than before (when it was in its fixed form). This isn't just philosophical, and you don't have to get related with some motivation from shattered glass. All you need to do is to just come out and let the rays fall on you!