I believe it's something like the adage, "it's difficult to make someone understand something their paycheck depends on their not understanding."

Think about people who will tell you lobsters can't feel pain while they're rattling in a pot. The idea we are the only intelligent species, and that everything around us exists only to be exploited for our benefit, is quite convenient.

Edited to add: I think this is also related to the way tech companies view their users. They aren't humans with needs to be fulfilled, they're a resource to be extracted. More a coal mine than a customer. (Not to lob a grenade into the discussion, I just found it relevant.)

I think it might be quite the opposite. Our highly developed minds/egos sometimes cloud our ability to see reality as it is, and often make us believe that we are more/less special or gifted than others.

There is very consistent supporting information to explore that thought further.

We rely too heavily on structured vocal responses to determine intelligence. On top of that we rely on observing erroneous unnecessary behavior to consider something might be thinking. This could be a real limitation of us as a species.

I don't think it's intelligence, but humility.

We are (hopefully) transitioning through an era where being a conqueror is less successful than collaboration. But there are way too many of us who are less than seven generations separated from conquerors. Conquerors bank on exclusiveness, not inclusiveness.

We're still trying to convince each other that all the humans deserve to be in the Humanity Club. If we can't hack that, then who is going to want to talk about cetaceans and chimpanzees and corvids?