The problem is, if you build a new financial system which facilitates criminal activity such as scams, fraud, extortion, money laundering, tax evasion, terroris

The problem is, if you build a new financial system which facilitates criminal activity such as scams, fraud, extortion, money laundering, tax evasion, terrorist financing, etc., it very quickly gets dominated by the types of people who want to perform such activity, or end up performing such activity ("opportunity makes a thief"). So the options are either to become more and more attractive to criminals and help build up their strength so they can take on the traditional financial system more effectively, or to become more like the traditional financial system and try to stamp out such activity. Personally, and I think most rational people would agree, it would be better for society as a whole if we didn't let the scammers, fraudsters, extortionists etc. win. And I know the typical cryptocurrency supporter's response is going to be "well banks and governments are scammers, fraudsters etc.", but while banks and governments may not have a completely spotless record, the fact is that they are on the whole infinitely more trustworthy than the tiny number of unelected and largely anonymous people who own almost all the cryptocurrency wealth.