"The Buddhism everyone talks about" exists only in books and at higher-class Arizona resorts.  Actual mass Buddhism is as capable of organized violence as any other religion of peace.  Two cases in point: Japan's Zen establishment enthusiastically supported Japan's war of conquest in China and the Pacific, and the Buddhist Sri Lankan government systematically massacred Tamils (Hindu by religion, called "idolators" by the Buddhists) and oppresses them today.