^^^ But that's the point. You can't easily steal someone else's bitcoins, even if you shoot the guy dead.
In Bitcoin meetings, nobody has to tell anybody about the intricate details of how many bitcoins they have. In fact, nobody expects anybody to tell this stuff. All they would be doing is one-on-one discussing about bitcoin strategies, and general strategies for financial planning.
Church meetings do similar things, without people always being forced to divulge the intricacies of their family life (their bitcoin passwords).

You can't show anyone the balance of your application where you keep the balance of cryptocurrencies, even to friends. Of course, it is impossible to talk about specific amounts with strangers - even if only you have the password to your wallet, but for a lot of money people can harm you. You will easily find stories where Bitcoin millionaires were tortured, kidnapped, and the like. It is better to keep a distance, and limit communication via the Internet.