Are They Just Monsters?

Is the true reason that they kill simply because they are monsters, devoid of any moral inclinations?

Could it truly be that some people are just bad eggs? Are they perfectly aware of the types of heinous acts that they are committing to humans, the same creatures as them? I am sure that there are some that are completely aware of their cruelty, and have absolutely no remorse for what they've done. Are these people the monsters of the world, even worse than in the stories we were taught as children? Not all serial killers could be identified as monsters, and some have shown remorse for their actions. Yet, there are still the cruel, cruel demons that show no mercy, and do not care to repent.

Ted Bundy once said, "Most serial killers are people who kill for the pure pleasure of killing and cannot be rehabilitated. Some of the serial killers themselves would even say so."