I have to agree with @dacree here.
The psychology of pedophiles was heavily discussed in this thread. Sadism and pedophelia are only tangentially-related psychologies - in that both actors seek control - but they do it for very different reasons.
Many pedophiles seek association with children because they cannot cope with adult relationships, but they only seek psychological control as a means to an end. They only require control for the stability and security it provides. They seek children because they can more easily direct the relationship. (It’s the same reason someone may seek a relationship with a sex doll.)
Sadists enjoy giving pain. It’s the cruelty itself that they desire. (They respond to controlling others through pain.) They take out their frustrations on their sexual partners, work partners, wait staff and more. Sadists enjoy being cruel while most pedophiles don’t seek that out, and will only deliberately injure a child out of frustration (they don’t see the sex as “injuring” and most never have sex with their victims). Here’s a good article about sadism, and how it differs from psychopathy, narcissism or Machiavellianism.
I feel it’s worth explaining this because so many psychological disorders get lumped together when discussed, and that’s something important to avoid.
