Over the last 20 years, a number of persons have suspected that several classes of prescription drugs themselves increase the risk of violence by the person taking them. Persons taken SSRI drugs used for anti-depressant or anti-anxiety medication seem to be over represented in those who do mass shootings and other similar crimes.
Recent studies have found that these drugs seem to increase the risk of conviction for violent crimes; if so, it would stand to reason that they are also increasing the risk of wrongful homicides and bad handgun usage.
A widow recently won a case against a drug maker based on the failure of the label to properly disclose risks of increased suicide.
The fact is that we have now batches of drugs taken by 5 to 20% of the population that increase the risk of that population engaging in unnecessary and thoughtless violence.
Victims, it seems, might be able to go after the drug manufacturers for failure to disclose the increased risks of homicidal behavior.