I don't think those behind EOS would disagree with you from a U.S. legal perspective, because they are clearly deterring U.S. citizens from acquiring the tokens, although I do find it intriguing how the U.S. has the power to bend the rest of the world to its whims (FATCA perhaps being one of the best examples of this, as you mentioned elsewhere):

It was decided that U.S. citizens, residents and entities should be excluded from purchasing EOS Tokens in the token distribution because of some of the logistical challenges associated with differing regulations in the many states of the United States of America.

Link: Upcoming EOS Token Distribution - US Citizen Restriction - and Other NOOB Questions

Of course, as what happened with Armstrong (and more recently, Martin Shkreli), if you're in the U.S. (or with most govt's for that matter) and they want to target you for something, they can easily come up dozens of reasons to do so.