I honestly think these types of things are "tells."
People who torture the neighbour's dogs, and leave it's body parts on their doorstep, really are potential serial killers in the making. They enjoy seeing living things suffer. They enjoy the power that comes with taking life. It's not as big a leap as some people want you to think.
Ditto for people who take someone else's body, hold it there against their will, and take out their frustration on it. They believe their wants and needs are more important than yours, that they are the subject, and you are the object. their object. That's the mentality of a rapist, or a guy with a sex slave chained to the furnace in the basement. Degrees of severity? Sure. But same "type"? Yup.