If you are optimistic for others you ancourage them to do stuf. Doing some stuff that may not work is 100000% better than watching Netflix/TV. Especially in current nihilistic social climate.
Pessimist and optimist are both right (not my quote)
Example:
Pessimist: I will not get this job -> So I will not even apply -> 0% chance of getting a job -> 100% correct
Optimist: I will get this job -> I apply and prepare -> 20% chance of getting this job -> 20% correct
But who cares if you are correct. What matters is taking a chance. This comes way more useful if you are optimistic every day. So you apply for a job whenever there is a chance. And if you apply for 10 jobs from initial 20% you get 89% chance to get a good job.
Realists are just pessimists.
You should be an optimist even if you are faking it. To lift others up.
Optimists are delusional
Being naive is not the same as being optimistic.
Optimists are aspirational. The placebo effect is real, and pessimists use it counterproductively.