"Just make the preview button smaller and below the post button. Then, have the preview page have huge THIS IS A PREVIEW text on it. Problem solved."

But won't that be confusing? Its the same problem you get with having two mouse buttons. Computers are here to help us, not hinder us.

Users shouldn't need to have any capacity for basic comprehension, nor should we expect then to posess even a basic awareness of their surroundings.

Why are you and your fellow nay-sayers trying to delay the user interface utopia?