Here is your big chance to enlighten the minds of your students about real facts about WW2. This PPT is recommended to introduce the unit which focus on the victims of the atomic bombs, but leaves a blank space about "why" it happened. After that ppt you can make groups and ask them to think of 5 reasons why Japan should continue a peaceful country. If you have the guts to go even further, let them talk about what they think the article 9 should be changed or not.
Please feel free to change it the way you like, but remember to submit a copy to ALTopedia.