Does "natural evolution" include the exploitation of their world by a being from outside the galaxy? All she is doing to this area of space is removing an alien presence that has distorted both the Kazon and the Ocampa's existence. And I think it is only natural for Janeway to take a more Kirk-like, case-by-case approach to the PD as she travels through the DQ. Sometimes inconsistency is what makes sense. As a parent, I've learned that I have to deal with each child as an individual--what works to help one child fails with another. Strange as it may sound, inconsistency can be more fair than a rigid approach.