Some people think that bitcoin is a scam as a result of their frequent encounters with fraudulent activities using bitcoin, and sometimes, bitcoin platforms. No matter how genuine bitcoin as a currency is, frequent encounters of scam with it or its platforms can change people's mind to consider it as a total scam without distinguishing between bitcoin and scam, but that is not appropriate. For example, for the fact that pound or dollar is a genuine currency, does not mean that scammers can not use them for scam, likewise bitcoin.
Some of these people don't even have any experience with anybody in terms of being scammed, they only work on their ignorance, they only hear stories of Bitcoin being used to scammed people or one story related to Bitcoin in a negative way.
These are the same people that need to be taught the in and out of cryptocurrency, 85% would learn while the rest would still live on fake information they have about Bitcoin.
They prefer to be scammed using paper money than Bitcoin, that's because they can see it, they can hold it and feel it (that's paper money) so that way to scam them is some how higher than using Bitcoin, only if Bitcoin is like fiat I believe people would gain interest and see it as something genuine rather than seeing it as a scam.