Those banks that come up with the "your own security" excuse and lazy. They can't even come up with a better excuse. They can't even guarantee their own security so why should I trust them?
Trust them and sacrifice your privacy while security is unknown. Who will make this bet?
Smart banks would know by now that they can't win against Bitcoin. Maybe they can win against other centralized altcoins, but when it comes to Bitcoin, all they can do is fight, they can't win. And the longer they fight, the longer they miss out.
Central banks and commercial banks know that Bitcoin is a big risk for them. When more people know about strength of Bitcoin network and Bitcoin transactions like its strong decentralization, capacity to proceed transactions safely and irreversibly, no censorship, more people will use Bitcoin network more than bank wires to transfer their funds.
Bitcoin stands against every fraudulent wall they build.
They should be lucky there are still people who don't trust Bitcoin but trust fiat.
Banks mismanage customers funds all the time but they're here acting like our personal lord and savior, it's so bad people are still falling for that crap.
There will be people who trust Bitcoin, trust banks only and there will be people who trust both, use both. Central banks, commercial banks, Bitcoin will continue to serve human societies and none of them will disappear or die.