And it begs the question of the extent to which the presence and availability of so many guns in a neighborhood does anything at all to deter, as opposed to, invite more violence in that neighborhood. I suspect that it is the latter, which would be ironic. People buy guns to make themselves feel safer in the face of potential danger, but then those guns are available for other purposes--suicides and domestic disputes with family and neighbors. That would explain the modest rise in violent crime in those neighborhoods. The question not addressed in the meme is the cause of the rise in violent crime. Does it come primarily from people inside the neighborhood or from strangers to the neighborhood? The conversation on Reddit goes into this issue in more detail, and one person who claims to have read the study says that there is some statistical evidence that the perpetrator of a crime in the neighborhood was more likely to live in the neighborhood.