That is not how intelligence services work, and none of that is "Orwellian". There is a long and complex legal course a case on a suspected individual has to take before ever even getting close to a very specific watchlist. We're talking about a list that may have a hundred individuals on it, tops. And there have to very heavy suspicions to put anyone on them.
I know that's not how it's presented these days (and obviously the Patriot Act shit doesn't help), but it is a legal structure that the state has to follow. You don't just get on a list for saying "Allahuh Akhbar" before going to work. Or even being in a white power militia that has no known incidents of violence. Sure, not a nice guy, but statistically unlikely to suddenly change that pattern.
More importantly, NOBODY IS ADDED to the already existing list. The Orlando shooter had already been on that list, and would have given law enforcement / justice department the legal means to intervene, if possible.
edit: as I understand it, and possible a bit biased towards the European way of doing these things. Obviously different countries use different legal means.