The first is fear of unnecessary demands whereby some people for no reason will just go against the adoption of bitcoin just because of their own selfish interest, another one is fear of missing out, some believed that if they invested on bitcoin it may turn to be like the same ponzi schemes that has been scamming people over the internet a d wouldn't want to be a victim, another is lack of proper research and understanding about what bitcoin is and how it will change their financial economy into freedom they have always deserve to have.