I would say majorly of those people who see negativity side of Bitcoin are mostly uneducated. Not all people invest in things because they feel is safe, some do base on referrals and the availability of money.
Uneducated people are left-out from bitcoin because of their lack of knowledge, but these negativity is spread by well-educated and people with authority. Uneducated people don't go the extra mile to spread unnecessary negativity.
Adopting new technology for people who don't have prior knowledge is hard, take internet as an example, people used to make fun of internet when it first came out but now life without the internet is unimaginable. So btc adoption will take time, it is normal that people have negative views about bitcoin.