I think the reason why this set of people are still thinking this way is because they have not done their research about what Bitcoin is all about, they just believe since it is something we use money to invest in online, then is Ponzi scheme.
Anything you really don't know do research about it before giving your concussion so people won't see you as a fool or you won't end up losing a life time changing opportunity.
The fact is that some people has chosen to be ignorant as a result of the current happening in the environment, and you know people are a product of what they feed themselves, once a negative mindset is activated then it becomes permanent and they can't see the positive side anymore. So no matter how you try to convince people who are negatively minded about new development, they will still not believe you because of what they are built on. The economic situation of the country has made people not to believe there is opportunity online. Any online investment looks like scam to them. If I iwas not convinced enough I would Also have believe that to be true because at a point in my life I thought everything online is scam till I met the forum. So I would not blame such people who are ignorant. But however I can only
doydo my Best to teach those who can be interested and not those negative minded type.
After all many all called but few are chosen.