One thing we know, and that the FBI has known since the 70s, is that animal abuse correlates with violence against humans. This is why, in a more perfect world, Humane workers and social workers would be cross-trained to look for both and we'd have a better reporting/database situation.
(They are working on this now with an animal abuse database through the FBI. However, I believe they only track felony abuse, and most states do not prosecute some pretty serious animal abuse as felony. For instance, in Kentucky it's only felony animal abuse if it's torture. And it's always hard to prosecute animal abuse. Plus, abusing horses and other animals considered livestock are not covered by most abuse laws, but it doesn't make those people any less dangerous.)
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