That's where regulation comes in, where government comes in, where centralization comes in.
Do you seriously believe, that if Bitcoin becomes the global currency, that crime won't skyrocket due to people getting robbed relentlessly? You just need the PK dawg, and it's very easy to tell if you were told the truth - access to the wallet opens up.
I think you are just naive about the nature of mankind. We need rules, structure and order - the key question, is how do we create the environment that allows enough structure to not interfere with the creative process to allow us to continue growing and developing new technology?
Bitcoiners have a sad, yet fascinating trend to talk about nothing but Bitcoin. Take a look at your comment history.