Someone who tortures or brutally kills an animal clearly have some psychological issue with anger and it can be an indicator that they will be a danger to society.
Someone who shows such an extreme attachment to an animal that they would value the animals life over that of another human being are also showing a kind of misanthropic behavior and it too can indicate that they may become a danger to society.
For example, the extreme views of animal rights and the unhealthy emotional attachments held by the Animal Liberation Front members lead them to commit acts of terrorism that has lead to the death of innocent people.
They value the life of animals over that of human beings and are a danger to everyone.
Obviously most people who cannot control their anger will never become mass murderers, just as most people who hold unhealthy attachments to animals will not kill a human being to save an animal.
However, both should examine their behaviors and correct the problem for their own and everyone’s good.