How Do You Like This Now?

People love to manipulate and twist scripture so it can fit their ideas. Why do people tend to twist peacemakers in Jesus' sermon on the mount to mean people who make worldly peace and not spiritual? What ever happened to God commanding the annihilation of the Amalekites? That's sure not peaceful, but that was perfect and right. How do those people explain those old testament scriptures like that? The holy, just, righteous and perfect God command that a nation be blotched up, that meant that Israeli going to war and slaying the Amalekites was holy, just and perfect. What kind of kink does that put in the peace loving misconception that people lick up in this current age?