Contrary to popular religious beliefs that “the world is getting worse” the opposite seems to be true. We are living in the least violent period in human history:
For example, during the invasion of Asia/Europe by Genghis Khan in the 13th century, there were an estimated 40 million violent deaths out of a total of 400 million, that is 10% or ten out of every hundred people were killed.
During WW2, often assumed to be the most violent event in the history of the world, there were an estimated 66 million violent deaths out of a total population of 2.3 billion. That is 2.5%, in other words two or three out of every hundred people were killed.
And since WW2 things have been getting even better. See prof Stephen Pinkers fascinating talk on the decline of violence: