Are you saying that you actually think my argument is analogous to condoning stealing from cars or houses if their owners had trusted weak/faulty locks?

If so, I strongly disagree. Cars have a "locked" and "unlocked" state. They provide a button, which anyone can locate, for the owner to toggle the state. When you try to open the door, and it won't budge, it's immediately obvious that the door is locked. This is nothing at all like what happens when Safari disables 3rd party cookies by default.

But if you want a CAR analogy... It's like making a car that ships without windshield wipers pre-installed. You justify this by saying it makes it harder for passers-by to put ads on your car. And 90% of the people who drive the car can't figure out WHY they can't see the fracking road when it's raining!