Optimism usually sounds dumb because most people don't justify it well. It winds up sounding like marketing. All promise, no substance. A pessimist will generally provide right/wrong but specific reasons why it won't work out.
Optimism is believing that good cars exist and can be a lot of fun. Pessimism is complaining that one person's Corvette is going to wreck the planet.
Optimism is believing that good electric cars exist and can be a lot of fun. Pessimism is saying that they'll never work and are terrible because our grid will collapse if too many people buy them.
Optimism is also believing that both problems are remarkably solvable.
