Liberals often just sort of assume that cultures and complex systems are just objectively "there" instead of being emergent phenomenon. To give a simple example, Germany and German culture are just objective things instead of emergent phenomenon arising from German people existing. Even if you import 500 million Somalis or whatever into Germany, Germany will always just be there and continue working fine because Germany is an objective thing that exists independent of (ethnic) Germans. Yes, I obviously know that "ethnic Germans" are actually themselves an emergent phenomenon arising from historical interactions and processes, this is a simple example for people who aren't versed in Right Wing thought.
In fiction like Star Wars, wherein you have a vast number of different races and groups and such, this leads to incredibly diverse, cosmopolitan, and multi-racial environments. But everyone sort of just filters back "to their own kind" because of biology. Ithorians as a group can never die off because Ithorians can only breed with each other, and they're just sort of going to. Ithorian culture, likewise, will always have a redoubt in Ithorians being together because there's always an impenetrable barrier between the races. In short there will always "be" Ithorians, and there's nothing that can be done to change that short of outright extermination or expulsion. This is often contrasted with what is a blatant standin for White Americans (In Star Wars, this is humans) who don't "have" a culture, because (like Anglo-Saxons in Liberalism) they're the "baseline species", the "true people" by which everyone else is just a variant of. "Culture" is ultimately a quirk that is allowed to exist because dumb barbarians haven't civilized themselves yet (which is to say adopted the culture of the baseline species). In Zootopia this is sort of left out (and kudos to them for it), but it is found in an atrophied form in the sort of naive idealism Judy has.