In my opinion, the central elements of Western Civilization—the ones that made it so great—are the concepts of reason, order, and individualism. (These are best embodied in Classic Liberalism.)
Traditionalists seek to preserve particular material embodiments of the culture, like ionic columns and old-fashioned costume. They rarely pay any attention to the ideas at play; even the best rarely go past a fixation on language and religion. While one cannot deny the positive role those played in our history, they are not essential. Christianity spread so widely because of its content and the military superiority of its adherents. English became the global lingua franca for the latter reason, and because it is so adaptable. But these alone do not make or break a civilization. Ideas do.
In the rush to put their cultures into hermetically sealed containers, traditionalists will not save them, but destroy them. Force is antithetical to reason, and reason is integral to the West. Fascism—excuse me, “European Traditionalism”—is like putting a dove in a glass jar. You’ll preserve it, all right—but you’ll also kill it!