Bad analogy.
A car doesn't ship with soft tires, the air condition set to high, etc
Being stupid is relative. You can suffer from battery drain without being stupid.
Come to think of it, it is a bad analogy. Maybe a better one would be loading a bunch of stuff into your car and then complaining about the low mileage because you can't be bothered sorting through it and getting rid of the stuff you don't want.
The iPhone's battery right out of the box is just fine, you could get a few days out of it if you really wanted to, it's when you bog it down your own stuff without properly organising it that the battery life starts to suffer.