Bitcoin is not a fraud and it will be nearly impossible to kill it. This is first of all because bitcoin is decentralised which means that there's no central authority that could be brought down to destroy the system. Also, it can work even if all the technology goes down as the mining can literally be done with a peace of paper and a pen if the difficulty goes really down. That's why btc is wonderful.
Although there a lot of fraud people linking to bitcoin but bitcoin itself is never a fraud and i know people in this community can prove it. No one can kill bitcoin ecxept for the people themselves when they chose not to use bitcoin anymore as a currency or even as an investment.
It is not our concern if someone view bitcoin as a fraud, they are just proving that they do not fully understand cryptocurrencies specially bitcoins. There is ignorance because they do not know what they are saying. I just ignoring people who saying it is scam because I do not want to hear their opinions. They are just tarnishing the whole cryptocurrency market.