In the end, it may well turn out that knowing what kinds of guns he used isn’t nearly as important as what kind of drugs he used. [More]True, but it would also be easy to ignore if these medicines do good for some and look at what the attributable violence percentages are before enacting anecdote-based "solutions."
This needs to be something that is rigorously studied, and that does not lend itself to a quick fix. But yes, by all means, give it scrutiny, just make sure it's scientific and not agenda-driven.
[Via Brian P]