Also, and I could be wrong here in Lennon's case specifically, but back then a lot of the English rockers would move to other countries during tax exiles to keep their government from taxing them so highly. If that's not why Lennon came here, then I stand corrected, but it's possible. I believe the Stones did it, as did the members of Led Zeppelin.
And was Lennon ever granted citizenship here? Because if not, then the random scrub's opinion DOES mean more than his did. Sorry, if you're not a citizen here, or you are one and not registered to vote, you really have no right to complain in my opinion.