This article documents how Congress and various state legislatures have blocked the possibility of doing real research on gun violence both by attacking funding at the national level and by attacking the sources of information at the state level.
Believe whatever you want in terms of gun policy. Whose good is served if we prevent research into the causes of gun violence? Injury prevention research has done a lot of good in other areas, but we cannot know if it will here unless we do the research. Is it so we can keep saying results are inconclusive, so we can only do odd national-level policy comparisons to other countries instead of real research?