From my perspective, it's like they read everything, look at your Facebook posts, your emails and what not, trying to profile you as a threat. And when they do so, you'll get on some listed that's automatically generated by some crazy scheme, and you'll no way to change that because you're not American, you're just some unimportant foreigner.
So although I have very strong opinions on the matter, I'm effectively censored by fear of hindering my future.
The more people that voice their opinions, the more impossible it becomes to punish that group (i.e. safety in numbers). Join in!