Language, from the time of Socrates, has been a weapon to use against humans by other humans. That's the game mankind, unlike our trusty canine and feline companions, play. Read George Orwell for more about that.
Public relations agency Edelman got slammed because of how its words were interpreted by so many layers of media and watchdogs. Here is Stuart Elliott's account in The New York Times.
However, Edelman's mindset wasn't mean-spirited. Not on climate change and not on the death of Robin Williams.
In indicating that it wouldn't rule out taking on as clients those which deny climate change, Edelman was thinking like a business. Some would find that praiseworthy. A wiser choice of terminology might have been to change the phrase "climate change denier" to "those not aggressively supporting climate-change activism."
In using the term "opportunity" associated with Williams' death, it was again thinking like a business. Business is about spotting, pouncing on, and exploiting opportunity. Only, perhaps that might not have been the best choice of words. A better one might have been "mandate" to accelerate the global conversation about clinical depression.
Of course, all this will blow over. But Edelman as well as so many of us learned or re-learned the horrific lesson: Words can and probably will be used against us.