Ok, if whales are so smart, communicate sophisticatedly, do art [art?? Lol] why did they allow themselves to be hunted nearly to extinction with hand held harpoons? 
Whales do have some pretty impressive commication adaptions—in the sense they can do so over hundreds of miles. Yet, the word[?lol] apparently never got out that groups of men in long boats were terribly bad news. But countless times they would come up for air within distance of a handheld harpoon, instead of diving deep and swimming miles away.
That isn’t too bright, by human standards.