I always wonder what might be the reason of centralised authorities not accepting the power of Decentralization and then found the reason,if so decentralization becomes the only means for the transactions then most of the regulators and authorities might be jobless and so they are putting maximum to let down this technology by creating a hype that all the crypto currencies are scam and you can making nothing out of them investing,so we Crypto enthusiasts need to put our maximum efforts to empower decentralization .
I am not against your ideas but honestly you missed some important things to look at why authorities are really trying to stop or regulate the use of cryptocurrency. The main reason of all and the biggest is the effect it can cause to a certain economy. You know how cryptocurrency can be used to transact between people being limited by boundaries so easily. Money can be at hand anytime anywhere but these may not be good to a country who losing too much money true expenditures that might not be so necessary at the moment and thus creates wastage on the part of resources held by the said country. This is why there must be regulations for the good of all and not just for a few. Though I don't like this either but this is also the reality to face.