Once again, in case you didn't read the two posts already about this: I CAN BYPASS THE IPHONE PASSCODE EASILY!!!
You have some of worst logic I've ever come across on technology forums
1) the passcode lock works, but much like a real lock it can be broken into, You don't expect that your run of the mill thief is going to know how to pick a door lock/hack into your iphone.
If you are stupid enough to leave your door open or not even put a passcode lock you leave yourself open to all thieves, smart or dumb
2) Putting a passcode lock will protect your data. Connecting it to a computer via itunes or even the program you mentioned iPhone Explorer will not allow you to view the data, and if you try to delete or modifiy the password it will render the phone useless. Again a common thief is not going to be trying to modify a ram disk or hack into the iPhone