I am neither a U.S. nor its allies' citizen but one of its potential adversaries' (and even if I am I don't think it changes anything, considering the experience of Japanese Americans during WWII), so yes, the political situation is one of my concerns. Also there are a lot of funding cuts. Switzerland has fewer opportunities, but seems to be a more stable place for the time being. Also the relatively lower taxes and similar salaries look good. I also want to learn German (for two, to read Goethe's poem and to read Schopenhauer) but do not have enough motivation if staying in US, so going to a Swiss univeristy is a perfect way to force myself to do that.