I've read that people who do sick things like this to harmless ******* are also the ones most likely to harm ********.
But that's OK. I think that Karma has a way of giving people what they deserve before it's over with.
It is part of the triad of serial killers. A lot of serial killers started out with harming small ******* mice, cats, rodents, dogs, the such, and later on would move on to humans.
The other two part of this triad is bed wetting (up to ages of 12-14) and pyromania, setting things on fire, little things and graduating to bigger things.
There are many other characteristics of a serial killer. However, this is known as the triad of serial killers.