I think they should unless the foreigners are Russians with Bette Davis eyes because they would only be here to spy on us and brag about how Russian wild strawberries are the sweetest strawberries in the World. Cheers!
Anyone should be able to comment here so long as they do it respectfully. We Americans have a bad habit of thinking that we are superior to everyone else. Seeing ourselves from the perspective of someone from another country may not be what we want to hear, but it's what we need to hear.