In America poverty leads to crime. Since many criminals choose to use guns, this becomes a threat to public safety.
The problem is not unemployment or poverty as much as the ripple effects these have on society as a whole. The insecurity causes people to take on primal behaviour.
No one wants to live without the basics. No one wants to live in fear. No one wants to break their personal morals & ethics. But when push comes to shove, chaos takes over. You see this in children when you have one popsicle and 3 selfish kids.
Individual morale drops when times are rough. When morale is low, productivity follows. There are some people who can get themselves out of a rut, but it is more common for people to continue the downward spiral.
Personally, I was born to a responsible family and have never felt the affects of severe poverty. However, I did grow up in an impoverished neighbourhood and have seen the desperation of some kids having no choice but to commit crimes for to feed their families (the parents put them up to it).
http://www.children.smartlibrary.org/NewInterface/segment.cfm?segment=1676
The underworld is filled with lost souls who started out as someone's friend in kindergarten. They broke their personal integrity seal somewhere along the way and have never come back. (this of course does not encompass all the criminal elements)
http://www.plu.edu/~poverty/stats/home.html
in addition, according to the above link, if we slice up the poverty pie, it appears that blacks and hispanics are make up a majority share over all other races (white & non white). According to the charts, it also shows that blacks and hispanics also have a greater ratio of children living in these impoverished conditions.
Children without proper education, who then become too preoccupied with survival will not likely seek further education. How can they get the college degree that will give them an opportunity change their situation? Even then, they have to outrun racism (which DOES occur, believe it or not). Where is the hope for these people? The violence and crime begins with poverty and an unsympathetic system.