One of the central themes in my criminology course is just how careful we have to be when using statistics to develop criminal justice policies and strategies.
While the “cruelty to animals” behaviour in early life does seem to be common amongst violent offenders (as does a lack of capacity to empathise in general), we rarely have cohort studies which allow us to evaluate the incidence of this behaviour in the non-criminal population.
We certainly don’t know why people who subsequently become serial killers often have have a history of eneuresis beyond the first few years of life. We know that they do, but we have no idea whether it’s any more significant than gender disparity in eneuresis or people who’ve developed nocturnal continence in their early teens being more likely to have offspring who develop urinary continence at a later developmental stage.
It’s entirely possible that bedwetters in general learn to emotionally distance themselves from responses to a behaviour which they cannot control, and that this emotional distancing leads to them being less empathic in general; it’s also entirely possible that the two are in no way related. Or there could be as yet unidentified co-existing medical, developmental, or psychological conditions which pre-dispose people to both bed-wetting and harming animals.
I’m surprised that “male” isn’t included on the list.