Sure, negativity destroys everything. Being optimistic means hope, life and knowing that there's always a chance, an opportunity, if not, you can build one, you can break the limits, the blocks and go through, to win, to own it, to know if all the doors are closed, you're the reason and you can open a door to a successful road anytime you want, you just must want it, see it and have the courage to lead yourself to it.
So yes, we need to more optimistic people.