Uncle Al once said: The best way to get caught is to send an encrypted email from a dusty little Pakistani town's internet cafe once a month (from where no one ever sends encrypted emails). It is like shooting a flare on a dark night.

And sending a plain-text email discussing terrorist plots is somehow less conspicuous?

Yes. Been to the mall with a ski mask on during the holiday season before? ;)

You seem to assume that encrypted communications are somehow rare or unusual. A large proportion of internet traffic is encrypted.

You seem to be the product of your area code. Realize/appreciate the difference in surfing habits of a rural Pakistani and yourself?

But why travel miles to a remote rural village to send emails, when you could travel to a larger town that likely has more varied surfing habits, and many more people online?

Not as clear cut as rural/urban. The definition of urban there is not more developed, its more dense in population. The semi urban areas have huge populations, plus the population sympathizes with them - city folk hate these guys.