Sure.
I mentioned it in my talk, but I think one of the big issues is the rise of phenyl-2-propanone meth. I said that earlier in my introduction.
When they were making crystal meth.... There are two enantiomers, two types. They're like handedness. The l-methamphetamine is a nasal decongestant, and the d-methamphetamine is the psychoactive component. They made it so that it's pure d-methamphetamine, so when you take the same amount, you're more likely to have a psychoactive outcome.
I think the rise of this in the drug market has helped fuel a lot of the psychosis that we're seeing.
I think all of these things combined are the things that are leading to increased random-stranger attacks in the population.