And you're already backing off your original position that historical interpreters=America bad.
Look, they're interpreters, not lecturers. Their job is to make history "come alive" for tourists. If you want "facts so you can form your own opinion," there are whole libraries out there for you. If you want to take the kids and let them see what it used to look like, you go see a historical interpreter at a historical site. Now, do you have some specific example of an historical interpreter giving an anti-American message, particularly this guy, since he's the one who kicked off your rant?