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Why do some Christians support the principle of the just war theory?

Sometimes war may be necessary and right, even though it may not be good. In the case of a country that has been invaded by an occupying force, war may be the only way to restore justice. Pope Benedict XVI said that defending oneself and others is a duty.

When a war is fought to protect people, it could be seen as reflecting Jesus' teaching:

Love your neighbour as you love yourself.
Matthew 22:39

Righteous anger is sometimes justified. When Jesus was angry about the presence of money lenders in the temple, he is said to have:

... made a whip out of cords, and drove all from the temple area, both sheep and cattle; he scattered the coins of the money changers and overturned their tables.
John 2:15

Righteous anger is about using one's anger in a way that is thoughtful and controlled to bring about justice or to protect the weak.