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Either way, I'm not sure how this bears out in practice, since we have at least three examples of serial killers (or other violent murderers) not only in the Federation, but in Starfleet*, which you would think would be pretty picky when it comes to psychological profiling.
*
Chu'lak, Field of Fire (DS9, Season 7)
Lon Suder, Meld (VOY, Season 2) - although Suder was actually never officially in Starfleet, having come to Voyager via the Maquis.
Walter Pierce, Eye of the Beholder (TNG, Season 7) - not a serial killer, but a murder/suicide perpetrator; pretty violent, IMO!
The cause of a murder/suicide is significantly different from the triggering factors (or extreme developmental alienation) for a serial killer. Frankly, crimes of passion like that are unlikely to be eliminated entirely. Chu'lak is a weird case, in that the murders seem to have little to no sexual element. He may have been a spree killer, rather than a serial killer. Vulcans, however, are noted for the murderous rage boiling underneath their calm exteriors—their psychology might have more numerous triggers for this kind of violent acting-out.