Don't wan't to be eavesdropped on?
Don't you just hate it when governments and quasi-made-up security semi-information-gathering grey-zone companies pop up here and there? Started with Echelon and went on with happy works as national and regional directives both in the US and here in EU. Go ACTA, CISPA, IPRED, FRA and whatnot in other countries. I can't even imagine what happens in Asia or Australia. Thinking of it... It is still very very illegal to open someone's post (that is postal service with actual paper and ink) unless there are very strong suspicion on that illegal stuff is going on in these mails. So if there is no hurry in breaking the law, why not just use messaging like we did before the internet? Worked then... why not now? And, oh, this works for other things aside illegal stuff too ;-)