As you might expect, many of these people believe that Bitcoin and all other cryptocurrencies will not benefit the economy, but rather only make it worse, and many are convinced that Bitcoin is yet another pyramid. And what upsets me the most is that among these people are economists, financial advisors, they should know better, than that...
Bitcoin was not created to benefit the economy, it is not a fiscal policy like what financial agencies implement. Bitcoin is a peer to peer network which offers freedom to its users. The speculative quality is a side effect.
So how do I prove them wrong?
Tell them to do their research on it, and make inquiries without prejudice. Most people who don't understand it would not take it to be a pyramid and those who have done their research and still think it to be one are FUDsters.