Whilst there is always a price to pay for convenience, would you be happy to state to a fatal aircraft investigation board that your convenience was more important than the lives lost of the people sat behind you, lives lost because you needed your carry on from the overhead bin? Or would you be happy telling the family of a deceased passenger that their loved one died because you didn't want the inconvenience of checking in to a hotel without a credit card? The answer will determine what kind of person you are, and what kind of world you wish to live in. I know where I stand and I vote for lockable overhead bins.