In my opinion, they are thinking like that because they dont have the knowledge about our modern technologies today, most of the people who are criticizing cryptocurrency are those people who are old enough that they cannot understand how to operate a simple ipad, so they literally dont have a clue about the way our system is going.
old generation did not open minded to technology developtment.and i am believe because of that still much people under estimate to cryptocurrency.
They are always demolishing the courage if someone talk about bitcoin before them. They start just yelling and ordering not to get into those fuss. They dont accept bitcoin or any other virtual currency and as bitcoin is totally nonphysical thing, so this never get counted in their good list. However still bitcoin is progressing and moving towards the successful tenure.