Violent criminals are frequently (always) vicious cowards with no stomach for a fair fight. The second they see someone else with a firearm defending themselves they head for the hills (usually abandoning their accomplices as well). 

Sadly none of the two-legged rats were made room temperature. 

NOTE: Has anyone else noticed that the mouths of these criminal vermin are virtually always hanging open in the photos they post of them. People who teach communication/etiquette often point out that when one leaves one's mouth hanging open when not speaking, it makes one appear less-intelligent. 

That is partially because the purpose of the human nose is to act as a filter - it's healthier to breathe through the nose and keep the mouth shut unless speaking, smiling in a friendly way or eating. People of low intellect either never knew or ignore this facet of human physiology.