The biggest banks in the world participate in money laundering, tax evasion, and as we have seen during the housing bubble, issuance of scam investments. If you know what you are doing, bitcoin is a ledger that anyone can use for money laundering, tax evasion, and for issuance of scam investments in counterparty.
I reckon that Nobel prize economist is paid to spread FUD because the big banks like HSBC do not like competition in their criminal activities hehehe.
Governments are fine with tax evasion and money laundering when some high profile officials get their cut. Bankers and said officials hate Bitcoin because they don't want average joe to do those things, without him the whole system would crash. So, they ask economists to write FUD against Bitcoin in exchange for grants or bribes or whatever.
But maybe most governments don't ban Bitcoin because they see how robust it is. Historically they have failed to stop people from taking drugs, including drinking, or downloading pirated content and so on, so instead of banning Bitcoin they hope to discourage people from using it while keeping an eye on those who do by regulating exchanges and requiring KYC. So far it works because a lot of users don't care about their privacy and keep using those exchanges and avoid privacy-related practices like mixing.