Bikes are easy to steal, fast to break through almost any lock available, make the perfect getaway vehicle on it's own, people are all wrapped up in themselves so it it does not affect them directly-so what?, and the most important thing of all, nothing happens to the thief even if he/she is caught almost anywhere. And there is always a willing number of people out there that does not care in the least whether or not the bike is stolen. So I am suprised that bikes are not stolen more than less they are actually are.
And the bike user/owner contributes to this mess by treating his/her bike as just another disposible piece of sporting equipment by leaving it around to steal locked outside in full view.