And that kind of logic is how people like James Mayhew slide in under the radar, until they start killing off fellow humans. If his crime is prosecuted for being the henious act that it is, all to the good. He should also be psychologically evaluated while in prison, to determine the extent of his likely pathologies, and therefore his risk to society in general. After he serves his time, he ought to be followed up with by a shrink if he has a serious mental problem, as a condition of his four-year parole. As a previous poster stated, the fear of punishment is usually the only thing that keeps people like that under control. Sadly, even that doesn't always work.
Animals are property at best and pests and disease risks at worst.
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This gives me a glimmer of why you take the position you do.