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while acting out on these urges IS wrong (illegal, immoral, etc.), actually having the urges can be (edit: related to a) clinical condition, or something out of the persons control.
pedophilia can be defined as acting on these pedophilic urges.
"the word pedophilia is often applied to any sexual interest in children or the act of child sexual abuse" - Wikipedia
A psychological trait cannot be a moral failure.
Psychopathy is a psychological trait. All serial killers have the psychological trait to want to kill people. Is that not a moral failure?