He makes it sound like this is an evil US policy. But in fact, every country I've ever visited outside the US, and I've visited a lot, asked me when I would be leaving and issued the appropriate visa. For example, if you visit the Philippines, the initial visa is 21 days. You can extend the visa, but again you must inform the government of your leave date. But if you mess around with Customs on this, you're likely to get in trouble all over the world, not just in the US.