Well the writings in the Old Testament which encouraged the killing of sinners were from a different covenenant between God and the people. Throughout the Bible seven covenants are made IIRC, and it is quite clear in the later ones that while God's views on sin do not change, he does tell us to treat sinners differently. The original covenants were made with Israel when it was a theocracy, however since people kept on breaking the covenants we've got to where we are now. So true Christians today focus much more on forgiveness than killing, because it's what the Bible tells us to do.
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