If it were we'd be justified in locking up queers as they tend to sexually abuse children as with same frequency if not more than the animal abuser goes on to violence.
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Perhaps I am wrong here, but I do believe that the animal cruelty-human violence link has been well-established with years of research and waaayyy too many cases in point. I don't believe the homosexuality-pedophelia link has been as well researched and supported with facts.
It doesn't matter once you start locking up people based on crimes they have never committed.