My reference for colonial Pennsylvania is _Albion's Seed: Four British Folkways in America_, by David Hackett Fisher. Pennsylvania was a remarkable place, with a lot of very impressive accomplishments. Fisher is full of praise for their Old World-quality infrastructure, much of which is still in use today; he also points out their peaceful coexistence with the American Indians, their roughly equal rights for women, and their rehabilitative prisons, concern for animal welfare, and interest in vegetarianism. But there's also how they refused to bear arms and expected the British military to protect them -- and how they enforced sumptuary laws and the like with corporal punishments, and drove off the Scotch-Irish as being just this side of subhuman.
Admittedly, one could make a very strong case that the Scotch-Irish really were just this side of subhuman. They were lawless, xenophobic, and economically improvident, as well as scornful of the laws and customs of war; they committed savage atrocities in just about every war they engaged in, and were more or less responsible for the Indian Wars, the Mexican War, and the lawlessness of the Wild West. Andrew Jackson, who ethnically cleansed the Cherokees and the other Five Civilized Tribes, is still regarded as a hero in Appalachia today, and his atrocities are either brushed off or openly celebrated.
A large and politically powerful Scotch-Irish population would have poisoned Pennsylvania; the Quakers had the choice between self-destruction and rejection of their principles. They chose to reject their principles -- and then they kept preaching them, completely unmodified, as if they'd never rejected them at all.
I'm Catholic, so it's not surprising that I'd say this, but I'd say that Catholic social doctrine -- with its strict criteria for just wars, and various prescriptions for government and suppression of crime -- is a better choice than denying the necessity of violence and then having to improvise a solution when violence turns out necessary anyways.