In my opinion, you should think about security not when everyone around you knows that you store a significant amount of bitcoins in your wallets, but already when you are thinking about buying bitcoins. If you don't have a family of your own then as an option, you can use multi-signature or start a second wallet with a small amount in case of physical violence from extortionists. But really, I think that when a person or their relatives are kidnapped and physically harmed, they are willing to give everything they have just to stay alive. Don't tell people around you that you know something about cryptocurrencies, and then you will probably never encounter kidnappers and extortionists.