What effects does watching violence have on people?

We can't avoid the things happening arounds us .
 For the peolple who really see it personally, it will be a trauma for them. It will be the reason for them not to go outside and think that going outside is not already safe for them.
 We should always be ready on the thing that will happen around us because we can't predict or control on what will happen. All that we can do is to be ready, be strong on facing those things and we should always have faith on god that he will never leave us alone.