There can be many reasons. Animal cruelty, like other types of violence, is often committed by a person who feels powerless, angry, unnoticed, and controlled by others. That person may abuse animals to shock, threaten, frighten, or offend other people or to rebel against society's rules. Some who are cruel to animals are reenacting things that they have seen or that have been done to them. Others may hurt an animal to get revenge on someone who cares about that animal.
All animal cruelty is a concern because it is wrong to cause another living creature to suffer.
People who are cruel to animals may well have suffered violence themselves, and they may well behave violently in the future. Research shows that young people who are cruel to animals are more likely to become aggressive or violent toward humans. They may be taking their anger out on animals or copying what they have seen or what was done to them. Hurting or killing animals can also be a warning sign that someone may be thinking about suicide. By reporting the animal cruelty, you not only help the animal victims but also help the person abusing animals.