Answer:
Young children, when see recommendations of violance, don't understand what they're seeing. It is just a common thing, going around the world, for them.
Children who view shows in which violence is very realistic, frequently repeated or unpunished, are more likely to imitate what they see. Children with emotional, behavioral, learning or impulse control problems may be more easily influenced by TV violence. Behavior problems, nightmares, and trouble sleeping may happen after kids watch violence on screen. Older kids can be scared by violent images too.
Talking with kids this age will help them, so it's important to comfort them and explain what they see to help ease fears.