For example I talked about bitcoin everyday, and my Grandpa is planning to buy.
at least she understand what bitcoin is about? or you told her that they are just money?
i think the problem with those that feel unsecure in using bitcoin is that they can't understand it well and how ti work, besides being lazy for securing their wealth
a part of the problem is because of the lack of enough places that accept bitcoin. for example you can convince anybody to use credit cards because they can use them almost everywhere , like in a shop, on an ATM or online in a lot of websites.
but when somebody buys bitcoin it would be just like buying stocks for a lot of them because there is not enough places that they can spend it. and it is more like an investment with high risks. which is why it turns a lot of people away from bitcoin.