Did you even read the Supreme Court case that you cited?
You state: “I want to be very clear that a thriving democracy does not ban supporters of a non-violent boycott movement from entry into their country. The United States recognizes this in the First Amendment, and, as ruled in the 1982 Supreme Court case, “National Association for the Advancement of Colored People v. Claiborne Hardware Co.,” peaceful advocacy of a politically motivated boycott is a democratic right of the people and responsibility for the government to uphold.”
Yet, the case has NOTHING to do with the First Amendment’s applicability into immigration or entry-into the US. Perhaps you read the case, but you certainly don’t understand it. (It is like saying that the Palestinians have a so-called “right of resistance” – that does not exist anywhere).
Further, the First Amendment does not apply outside the United States. Moreover, most European countries (and Middle Eastern countries) do not have free-speech laws that would comply with the First Amendment.