The NSA and other state agents may or may not be capable of reading my emails, but I don't think they would care about anything I write/receive and for sure won't sell/publish it because of the risk of the world knowing about their possibilities. It's still opposed to my interest in privacy, but the main thing I care about is my life not being an open book on the internet for everyone to see (or even just marketers), and ProtonMail sells that to me as a business model, which I still believe in.