Usually we do not appreciate what we have until we lose it. This saying is very true, because usually we complain about our physical appearance: If you have a low a height then you want to be taller; that if the hair is straight I want curly hairs; that if you are thin you would like to be a bit more robust.
However, when some tragedy happens to us, then we value what we have.
We will be able to feel depress for a a while, but we have to live life with optimism and find the fun part, as these people did.