I guess what you're saving is not mean as irony.
Ok let's say that we have 2 POPS - one is a pacifist human and the other is a reptilian who happens to like to eat humans for dinner. They live next to eachother.
So..
According to your logic: the human POP would learn to like/stop fearing the reptile POP ..because he lives in the same area and they are able to spend time with eachother.
I can tell you that IRL - that wouldn't end well.
Because those 2 pops share radically different values.
On the other hand if you'd have 2 pops: the reptile POP and a monkey-man POP who both like to eat humans and both like to wage war - they, though different species, would burry their initial fear/dislike because they follow similar hobbies and interests.
Same goes for a human POP and a star-trek-volcan POP.
The main criteria IRL is the culture and belief system not time both groups spend with eachother.
OK; let´s assume a human-eating reptilian lving among humans would obviously not be allowed to eat humans on a human controlled world.
In an area with a lot of these reptilians, the humans in that area would feel threatened.
In an area, where none of thes live, xenophobia may rise too, as their "taste" is the most disturbing (and perhaps only) fact about these strange reptilians the humans in that area know.
In an area where one of these reptilians live among hundreds of humans, problems are not really likely, the outnumbered reptilian is not a threat, and people will find out that he/she is doing a lot of other things too than eating.
So yes, values matter only on a limited scale.
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