Santa Monica shooter
Clayton Cramer has interesting thoughts. Reports indicate that the shooter had (surprise!) serious mental health issues, which led to his commitment (unknown if it was voluntary or involuntary, but if the latter it's a bar to gun possession and should have flagged him). California has had an "assault weapon ban" since the year he was born, requires all sales to be after a background check since he was a toddler, and banned transfers of larger magazines since he was eleven.
In short, he's an example of why (1) passing gun laws will not affect a murderous mental case and (2) why we really need to fix the mental health system.