>"we decided that her hunting of men happened more during her absences from the two men at the center of her life, or perhaps it met more with her interests to lure them in to be destroyed by Lacroix."

You're absolutely right that in the scenes we see, Janette's complex relationships with Lacroix and Nick necessarily play a key role. We so very rarely see her without them!

>"we ascribed it to the tendency of most procedurals and crime shows to have women as the victims"

That seems likely. FK is much better than most of its fellow procedurals, both in its own era and today, I believe, but it, too, is a product of its genre and era.