Don't you think it's strange that humans have little to no interest when root causes to their problems are found?
No idea what you're getting at here, though.
It's true that this is often not a big deal, but which times it is and which times it is not is not known (which itself is typically not known, once again because of the convention).
Talking about the phenomenon is also contrary to conventions, and typically extremely well enforced (as I imagine you noticed during the dispute with your incorrect classmates, or else you were smart enough to not push the issue).
This one single causal phenomenon underlies everything, yet we ~refuse[1] to examine it.
[1] Here I am kind of being hypocritical, in that I assume to some degree that humans have the base capability in the first place.