Criminally insane

I like to see anyone thoughts after reading this. I've watched a video about a murderer, whose mentally insane, getting interrogated by the arresting officer. He...confessed so easily, there's no lie nor bias in his confession. He was honest, polite, and so casual/calm while he was being interrogated. The officer asked if he felt any remorse, and he said, "I'm...sad that i got caught...so easily" He felt no regret, remorse, shame, nor fear. He's litterally so empty inside. He knew his girlfriend would be sad and heartbroken but he felt no different. He knew he deserved death sentence, after all, "An eye for an eye, Sir" he said and believes in it. He was found not guilty by reason of insanity. It's...scary, that people like him exist.