Yes, Tuvok is right.
I mean, I prefer if Janeway decide to remove the Ferengi from the place, but this is not Voyager's mission and Janeway have been uninterested with helping exploited people in literally the last episode.
I guess the Prime Directive doesn't really apply when Ferengi are concerned but I'm pretty sure there is a degree of xenophoia in her choice to help some people or not.