In that case all the government make bitcoin bank in future, they will ask for all accounts details and the person who access the account. If all holders gives them details then it will be it safe or not?
Not about safe or not, Bitcoin is invented to give people a full of freedom where they can control their own money, create their own transaction and hide themselves.
In case there is a bitcoin bank, there must be an entity that control our activity and it must be no longer decentralized.