A lot of scams have caused the fear of theft among people and they are regarding bitcoin and its trading a scam. People seem to be reluctant towards investing in bitcoins. How do we ensure them that bitcoins are not scam but the people are. 
I believe some of them already know scam occur not only in cryptocurrency, even in fiat currency, the currency that always they use, scammer still exist in there, maybe they just don't like Bitcoin, that's why they say something like this.