Kidnapping American Hikers: Worked So Well in N. Korea, Iran's Giving it a Try

We get two back, but give three up. What's the deal? ABC says:

"The three tourists were detained after evidently straying into Iran while hiking in the mountains in the Iraqi border town of Ahmed Awah, a popular resort area famous for its pistachio trees and picturesque waterfalls. The border between Iran and Iraq is not clearly marked."

Here's a tip: regardless of how beautiful and picturesque the pistachio trees and waterfalls are, you'd think steering clear of Iran right now would be a good idea. Go figure.