maybe bank hate bitcoin because people change their money into bicoin and save in bitcoin wallet,but they dont,bank give the secure about our money and when our bitcoin wallet is hacked its the end. secure more value than the money
you are right that banks give guarantee for the security of our money but people prefer bitcoin because the fees of transacting bitcoin is much lesser and with bitcoinwe save a large amount of our hard earned money, so we can buy any other thing with that saved amount.