In the country that I live, Bitcoin has a stigma of being a scam because our own government warn the public to not engage on Bitcoin investment due to a lot of scam involves it and the volatility is high. Most of the people here including the old professional don’t dare to touch it despite Bitcoin already has good price history.
I heard these arguments in my country too and I always find them misleading. It's not like a huge number of scammers just came out of nowhere with the rise of crypto currencies. The scammers where here before and used fiat money to scam people. And there would nobody say we need to stop using fiat money because of the scammers. Everybody can get scammed out of his money, it doesn't matter what currency he is using. Instead of trying to stop people using certain currencies the government should work on educating their people better. Only when the citizens are aware of the risk of scammers they can be more cautious. Bitcoin has survived for so long now that critics should stop doubting the success and rather be more open to it.
It is a natural phenomenon that people actually criticize and hate what is good when they don't use or know its value, and for government providing proper education for the people on a currency which most of them are also criticizing sound kinda absurd don't you think, although they are couple of nation which like and support the use of BTC but most government actually contribute to the massive hatred on BTC since its goes against their principles.