Say them: cryptocurrencies are the new form of digital money, created by people for people. There is no entity that could confiscate your money, you are completely free to use them on what you want without any limitations.
the concept was like this, but after they understand well cryptocurrency, they will know that there are not pure centralized
many coins, token, exchange are not centralized like its concept. even The most exchange is centralized
furthermore, regulations from government, such as KYC needed, AML, etc.