Moravians are not now—nor were they originally, pacifists. Quakers and Mennonites are (and always have been)—and have nothing in common with Moravian history(came from completely different parts of Europe)—except that some settled in the same parts of America (Pennsylvania).
I don’t approve of pacifism either, however, unlike some Methodists you mentioned, the Mennonites (I have a couple Mennonite friends from college) have always been that way—and not out of cowardice. They read the New Testament very literally (and don’t properly understand the Old Testament, in my opinion) and hence cannot put “love your enemies” (as Jesus did indeed say) and warfare together. (That Jesus highly complimented a Roman Centurion, and that soldiers were never told to quit their jobs in the NT, they don’t take into account...)
Anabaptists like Mennonites are very sincere however in what they believe their responsibilities as Christians are—and they are willing (and have, often) to suffer for it. That’s not being cowards—mistaken, yes, I believe so—but not cowardly, and not un-American. Mennonites for example were very loyal hard-working, risk-taking Medics in WWII....they helped their country, they just would not kill for it. Although I disagree, I do respect that...and so did Lee and Washington, by the way...
You wrote:
“Moravians are not now—nor were they originally, pacifists.”
They were pacifists in the 18th and 19th centuries, however - that is if you believe the Moravians themselves:
“Despite the fact that the 18th century Moravians were pacifists, gunsmithing was a necessary trade.”
http://www.moravianhistoricalsociety.org/education/nazWalkTour-3.php