If you view a world at a certain angle there is always something to worry about: 1. World in not perfect, it doesn't confirm to how we want it to be (and could not even in theory given that different people want it to be different) 2. The future cannot be predicted with 100% accuracy so even if all is perfect today you can worry that it will turn bad in the future.
When looking at the same reality one persons sees the situation as OK and another as a an endless and hopeless disaster it is hard to tell who is right. A depressed person would tell that most people around him are wrong and are optimistic only because they don't understand how bad all is.
When looking at the same reality one persons sees the situation as OK and another as a an endless and hopeless disaster it is hard to tell who is right. A depressed person would tell that most people around him are wrong and are optimistic only because they don't understand how bad all is.