Exactly, it depends on the beliefs of an individual about bitcoin, if you think it does not worth your believe then just don't, if you think it does then do believe on it, as the guy mentioned above, you should think that why would so many people be involved with something if it does not deserve believing?
Most people only look the temporal profit. They cannot understand or they don’t mind that bitcoin is a real revolution for the world economy. The logic of his creator as well as and those who had implemented it had other causes and not only the financial profit. So if you believe in creator/s beliefs you believe in bitcoin.
I believe that Satoshi is aiming something for the good of all people and as well as the world economy. But of course, we can't remove those people who are subject to against this good project. But I can say that as long as we already proved that bitcoin is real and tough currency. Then more and more of us will keep on trusting it.