Never too old to cry?

Ah! Poor fella!
Why is it that we condition our selves not to do exactly what he is doing? Tears of sadness are said to contain chemicals that are associated with depression and are genetically different to the tears of happiness. All this taken into consideration, should we not want to shed as many tears as we can and feel happy as much as possible. At the end of the day your brain is just a big sponge full of chemicals and canals and suchlike.