I don’t even care much on what people believe to be their reality of Bitcoin. When you find someone who is so firm on what he or she thinks he knows and even you approach is met with a strong resistance should you even try, I leave it to them and don’t care even less. It is their reality and you don’t owe it to anyone to persuade them to see through your lenses because they wouldn’t.
In fact, they would see it for a calculated attempt to scam them and worst still, should they see their coins dumped if they bought, should they misplace/forget their private key, should they be phished, should an exchange go wrong on them and the many other things that could result in lost of investment. Then you would have brought their fears to life and they have you to blame for it.
It’s just a best idea to let them be in their vague idea of safety. It works for them and so, it’s good for them.