Ok here is my 2 cents. Perp is very young and nervous drinking beer taking beer from victims house, not old enough to buy beer? Wouldn't surprise me to find he stole cigarette's as well. The voice on the calls sound really young, nervous, frantic. Targeting middle class homes, wrecking them, anger at that lifestyle. Broken home? Father died? Change of lifestyle? Lost the house had a rougher life? Mother becomes angry harder on him, blames father for not being there to protect him , take care of family. Is that why he humiliates the male victim ? Stays in house cooks, walks around reliving better times? Very intelligent, quick learner, low self esteem, no control in own life, bullied , would be considered a nerd, geek, in real life.