You’re doubling down on the “teaching” bit. I’m not seeing a “teaching” angle that makes any difference here. What is it that you think Vulcans taught humans than they wanted to teach Romulans?
By saying, “I don’t get why they cannot be friends.” you’re literally ignoring their entire reason for being written in to the show as opposition to Vulkan.
I’m not saying that. I’m saying it could be the perspective of the Romulans. The Romulans are less driven by logic and rationale than by their emotions and passions. Meaning, they’d make this assessment overriding logic and instead embracing emotion, envy and anger in this case.
Neither of them have the “correct” answer. Pure logic doesn’t work out, and pure emotion doesn’t, either. The entire point is that these “advanced” species still have fundamental social flaws and still conflict over silly things.
Absolutely, and humans are no exception to these conflicts. In the area of this conflict of thought process Humans, Vulcans, and Romulans are equal. There is no position that all 3 agree on 100% with each other.