Some intelligent people can explain the taxonomy of a goldfish. Others may swallow one . I think focusing one one word as a sign of intelligence is trivial.
Tomato ... tomata ...its the same thing yaar.
I think unfortunately it's just commonly accepted to interchange them. But I also think that even intelligent people often don't know the difference.
Update: I Edited this after see blissfull's answer. Sorry for stealing. It looks like you're mixing up about the definition of intelligence.
What you really mean to say in "knowledgeable or smart people". With that said, I'll simply answer as though you had said "knowledgeable" or "smart". Calling an ape a monkey sometimes is not insisting on it being called that, but merely intellectual laziness.
Now, if a "smart" person actually argues about apes being a type of monkey, then it would be considered insistence. If he is guilty of this, then he has no right to be called smart, at least not when it comes to biology.
I think it has a lot to do that not all intelligent people are well-enough versed in zoology to know that monkeys have tails and apes do not. They may know the intricate workings of bosons and leptons or can dissect Baroque-era music and show how it's an expression of the tumultuous times when they were written, but don't know something relatively simple like how many quarts are in a gallon. It's outside their sphere of knowledge and perhaps they just never had any need or desire to learn something like that.
2 reasons, habit or laziness. That is assuming they are intelligent enough to know the difference.
Intelligence is not the same as wisdom or knowledge, Being able to solve problems easily, or solve deep problems doesn't means the person has a good baggage of knowledge.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.