Every Cloud Has A Silver Lining

Does this idiom fit todays world?I remember reading a story about this ,way back in school.This basically means never lose hope..Today world is heading towards a major crunch...with wars ,terrorism,recession..Such situations test patience and endurance of people facing these.But,does every cloud necessarily have a silver lining?Or are we being over optimistic?Does silver lining mean that we always should expect happy ending?Should we not be realistic and face our current situation with more realism?Probally olden days every cloud had a silver lining,but now world is full of clouds!Does Gandhi's philosophy of showing the other cheek still work?Or again dont we need to fight for whats's right?Oh,well..at the end of the day,optimism is the only tool to survive.Lets hope every cloud indeed has a silver lining.