Out of 320,000,000 people, 166,000 are in prison for murder. That's .00052%. The murder rate has dropped in this country over time, not increased.
In 1974, 20,740 people were murdered in America. In 2014, the number was 14,249. Population increased during that span from 211 million to 318 million. The biggest change is one of perception. We have instant access to news and are inundated with it from many different sources.
Driving down the road is many times more dangerous than attending school. Some of you act like schools are the new killing fields of America. It's just not true. Cecil the lion was actually made into a bigger story than this because we now get to read the opinions of people who would rely on a 50/50 guess as to which hemisphere the USA is located in.