There has probably been a slight increase in the rate of violent crime in the US in 2015, and I say probably because the FBI figures are still not out for that year.
But even then that wouldn’t even be as high as it was in 2012, just three years ago, and that itself is a huge decrease in the levels of '60s, '70, and '80s in the US, where violent crime has fallen by more than half. Source:
http://www.vox.com/2016/8/16/12486586/2 ... -terrorism
Here's a principle to live by: PPC. Proportion, perspective, Context. All matters should be seen with those lights full on.