This trumps all the other privacy arguments. If the government wants to read your email, it need not access it at the endpoints -- it already has access to it in transmission over the compromised backbone. You would need to encrypt your emails to avoid this.
Which is why it baffles me that so few people use S/MIME--other than the trending preference for webmail which isn't well suited for encryption. S/MIME is simple to setup on most email clients, and offers encryption of the body of the mail if the recipient is uses S/MIME as well. There are several of us at work that send encrypted emails all the time.
Assume that any government, be it your own, US or other will read your email if they so please, and encrypt anything you don't want them to read.