How would the world be different if human beings were not inherently optimistic

What an average joe would think, is that the world would change into an emotional one. But if we look into it pretty much in-depth, we would realize that this wouldn't be the case. Here's why..

If everyone is not optimistic, people would have thought that minor, but yet fortunate happenings would be great, and not treat it as something as that should already have been there. On the the other hand, when we are actually optimistic, we tend to think the opposite, that people would instead think why such minor, yet fortunate happenings do not happen on him/her, since we remain optimistic, thinking that fortunate things would actually tend to happen on us. The theory behind it, is still about "Great hopes, leading to greater disappointment".

Another main reason, why the world could actually be a better place, is how people would appreciate things around us more, or become more cautious. If we do not carry the mindset that we won't be so 'fortunate' for unlucky things to befall on us, we would actually be more careful, and at times, appreciate how the safety around us is given to us so naturally. Compared to the current world, where optimism is instilled, people tend to wait for things to happen, before appreciation starts coming from the bottom of their hearts. Until we look at the state of living condition in Africa, then we know how fortunate we actually are. Until we happen to get unlucky and say for example, get robbed, then we know that we should be more cautious right from the start. Not being born with a cautious mindset, could have been a good thing as well.

This conclusion I'm giving now, is actually pretty weird. Judging from what I have just typed, and what you have just read, with the mind with a inborn trait of optimism, you would think that what I'm talking doesn't make sense. But read it again, with a mind with not that much of optimism. :D