Buddhism may preach peace, but it has often practiced exactly the opposite, as has Christianity:
http://www.bbc.co.uk/religion/religions/buddhism/buddhistethics/war.shtml
http://www.trimondi.de/EN/links.htm
http://www.sangam.org/articles/view/?id=118
http://www.mcn.org/e/iii/blog/2007/04/blog_04_24_2007.html
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