Does a facility for reason & maturity necessarily mean we should avoid acting on primitive, instinctual urges?

........I understand that killing an opposing threat could be considered instinct, or primal urge. But John Wayne Gacy hunted people in his own species, unprovoked,which I don't consider to be a normal urge, even for animals.... promiscuity, thats a primal urge, and people act upon it though its frowned upon.......I guess it depends on what urges your talking about, but I don't think its a normal primal urge to kill unprovoked......I think we do act on our primal urges but don't realize it.