I can't believe people are arguing that it
should be two presses!
One press is easier and quicker than two presses, right?
So when you're out in the rain and cold, and all you want to do is lock your car and run inside, which is preferable? One click or two? Two clicks would also involve listening to make sure you hear the deadlocks. One click does it all for you and if you see the indicators flash, you know
everything is done and safe.
And as for why you would want to disable the deadlocks, as somebody asked earlier, mainly because you have children or animals in the car and you need to leave them for a second. You don't want the alarm going off and deafening them and, should there be a
problem, you don't want to trap them in a car that can't be opened in any way from the outside