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Moving the lock/unlock to a central position it keeps someone from reaching through your window (cracked open) and unlocking your door. Central locking is a safety issue.
By requiring two pulls of the handle to unlock your door it deters them or at least gives you time to roll up your window or hit the gas.
BMW lets you autolock as soon as you go into drive or reverse...as do many other companies, and will unlock when you turn the car off. Point being your doors should be locked while your driving, so if at any time you need to unlock your car you unlock all the doors. Since the peg goes down when it's locked, it's impossible for 2 doors to be unlocked and 2 locked, since you'd need to dig it out (or suck it out if you're into that) to be able to unlock any given door without hitting the switch.
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