I agree that bitcoin is optimism 💯. I think the people who don’t get bitcoin have a multitude of reasons why they don’t get it. Pessimism is an attempt to protect oneself, and to remain vigilant to problems. Also, some of these people have gotten rich from the fiat system, and change is very hard. 

We might be able to convert some of the pessimists if we shine light on their pessimism. I believe anyone can change (but they have to be motivated to).