That includes First Contact, which includes members of your crew having their organs harvested and distributed to someone else. Yes the Vidiians are a tragic species. However, the Phage had caused a 2,500 year blight on the entire Vidiian population. Billions of lives. For the Vidiians to have survived as a civilization, they would've have to raid, harvest and murder hundreds of billions, if not trillions of other people to survive across the millennia. Janeway let the first two Vidiians she encountered go, and with the exception of "Life Signs", every subsequent encounter with the Vidiians turned hostile. So what would you do as a Captain of a starship? Meeting an enemy with all deliberate force is the Romulan way, but in this situation, I think it would be warranted for Federation officers to appropriate it.