It's wrong to enjoy people's misery.
Joe is looking at his phone on a bus.
Joe wants to see something interesting on his phone.
Joe watches a fictional program about teens who attack homeless people for thrills.
Joe looks at a site with videos of homeless people being attacked by teens.
Joe appreciates the complexity of art and humanity and the interesting themes the program presents with no one being hurt in real life.
Joe feels that he is drifting away from humanity and empathy by enjoying those things and  questions his capacity for basic decency.