What are the negative effects of optimism?

Can you elaborate on the potential drawbacks of maintaining an overly optimistic outlook in financial and cryptocurrency markets? While Optimism can foster a positive atmosphere and drive innovation, could it also lead to risky decision-making, ignoring potential warning signs, and a lack of preparedness for unforeseen challenges? How can investors strike a balance between optimism and realism to navigate the complexities of these dynamic and unpredictable industries?