The truth is that 15,809 people were murdered in the United States in 2015 and only 19 of those were homicides that had any association with Islam.

Homicide numbers for the United States in other years are similar to the 2015 numbers and are easily available on the FBI website and on the Centers for Disease Control website. (And other authoritative U.S. government sites) And at sites like Pew Research.

Q: Why does the U.S. media focus on the 19 (I'll use the 2015 numbers to make the example) instead of the 15,1790 victims of homicide?

A: Because nobody wants to criticize 'Jethro' driving around the U.S. with a loaded Colt 45 in his glove box.

I guess they are 'Jethro' apologists. ;)

https://www.cdc.gov/nchs/fastats/homicide.htm

http://www.pewresearch.org/fact-tank/2017/03/01/most-violent-and-property-crimes-in-the-u-s-go-unsolved/