Diazepam IS Valium. 10 mg is a pretty light dose. Since the shooter had had a script for the same amount last year, assuming no refills, I don’t think he was abusing it.
Whenever these horrid thing happen, we want to fix blame. We usually point to their meds or some “issue” in their lives.
I vote we just realize that there are truly evil people out there. Stop making excuses for them. Speedy trial and death by hanging in the public square.
Wonder out how it interacts if combined with booze