The problem is not so much about the expected behavior of a spy agency, or how the US government justify itself "But it's only on non-citizens". That's kind of expected, like you explained.

The problem is when the medias, the public and politicians are reassuring and reassured by that "But it's only for non-citizens".

To a foreigner like me, what I see is that US citizens, medias and politicians are just fine with my fundamental rights being violated. That is as long as I'm not a US citizen... a clear statement that to those eyes, the problem is of less magnitude because I'm not as important a being as US citizens are.

Do I have less a right to privacy because I am not a US citizen? Is it more ethical or moral?

I'm not talking of my legal rights on a US soil; because legality has not much to do with morality. Really, in this argument I don't care about the NSA's goal, or all the spy agencies' goals. I care about how the public reacts; nobody cared as long as it was only about violating the privacy of those without US citizenship. Second class humans.

That's incredibly insulting. It makes me angry.

And worst of all, I feel like I can't even express myself on that topic without fearing repercussion. When one day at the airport, I'll cross the custom lanes and some automated filter will have flagged me as a national security threat because I once posted outrage about how they treat non-citizens.