"Purposefully harming helpless animals is the hallmark of a murderer-in-training."The person who made this statement didn't qualify it, and without qualification it states that harming animals means you're going to be a murderer. So anyone who harms any animal according to the quote is going to be a murderer. Total load of cow squeeze. Or maybe in this case duck squeeze.
The three behaviors of potentiality for future serial killers (at least back in DSM-III days) were bedwetting, firestarting, and cruelty to animals or other children.
Oh I see. I didn’t read that statement as literally as you did. I understood it to mean dogs and cats and other house pets.