The Bible is the source for all cruelties people do to others.
The Bible calls for racism, discrimination, murder, and massmurder:
http://www.evilbible.com/Murder.htm
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Murder in the Bible
The act of murder is rampant in the Bible. In much of the Bible,
especially the Old Testament, there are laws that command that
people be killed for absurd reasons such as working on the Sabbath,
being gay, cursing your parents, or not being a virgin on your wedding night.
In addition to these crazy and immoral laws, there are plenty of
examples of God's irrationality by his direct killing of many people
for reasons that defy any rational explanation such as killing children
who make fun of bald people, and the killing of a man who tried to
keep the ark of God from falling during transport. There are also
countless examples of mass murders commanded by God, including
the murder of women, infants, and children.
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just some of the dozens of bad examples from the Bible (from the link above):