Hello all, just some clarifications:
The Japanese military didn't use Buddhism as an excuse for a holy crusade, Buddhism was actually suppressed at the time. They use Shintoism as an excuse. According to their dogma, the emperor was a direct descendant of Amaterasu, the sun-goddess, thus he was divine himself.
Second, Aum Shinri Kyo is not a Buddhist organization, they are based on Buddhism but also include some eastern religion: "The Aum Shinrikyo is grounded in Buddhism but with a strong mixture of assorted Eastern and Western mystic beliefs including the works of the 16th Century French astronomer, Nostradamus. "
There are many different sects of Buddhism like, there are in Islam or Christianity.. Men don't agree with each other and they start their own movement. Some are more aggressive in their recruitments and in their preaching. Most are harmless, especially the older one, founded in tradition.
The essential part is that as for as I know, no act of violence has been committed (by a sane person) or no war waged in the name of Buddhism. It would go against any of the precepts of Buddhism.
for more information please look here:
http://www.japanese-buddhism.com/principles-of-buddhism.com