[nickpsecurity]

And they put more effort into doing so with regulations from central authorities pushing it. There are no regulations, central authorities, or even strong investments in such security for the Bitcoin exchanges. So, again, how normal banks handle security vs how Bitcoins are managed is difference between night and day. You bringing in an exceptional situation for normal banking (a) doesn't apply to majority of normal banks, (b) distracts from fact that such things are normal for Bitcoin but not status quo its proponents want people to avoid, and (c) ignores that there's rarely effort in protecting Bitcoin exchanges that matches what players in existing system put in.

So, people should trust or build on existing system if they care about their stuff disappearing or being stolen. There's mitigations that work for that situation for the common case. Unlike Bitcoin and its exchanges.