Self-esteem in your child

My 8-year-old son loves to sit with me as I watch news and everyday he grows more and more inquisitive. Considering the things that are aired on TV such as violence in Syria and Iraq, I am having a big problem answering all his queries. He keeps asking me why people are killing each other. How best can I talk to him about the things in the news? Collin, Remera.
The New Times
Times Reporter