Why did God Command Genocide?

God commanded Saul to destroy Amalek. Many atheists use this to prove that God is unmerciful or evil. However, they ignore the details of Amalek's destruction. This video is a short explanation on why they were commanded to be destroyed.

Seth Fleischman gives a more detailed description of the events of Amalek.

https://www.youtube.com/watch?v=jJgVqBdmqNI