Blind belief that everything is OK is not optimism, it's delusional.
"Optimism is the ability to clearly see a bad situation – like the climate, energy and financial threats we simultaneously face – and work diligently for the best possible solution, even though these threats are enormous, complex and deeply unfair. Optimism is the ability to reframe crises as opportunities.
Optimism is attacking a problem with vigor instead of tuning out or laying blame elsewhere."
~ Letter to the New York Times editor, by Deborah Fisher of Brooklyn