Comment by TomLisankie

Yes, he's a human. But what you are failing to mention is that those corporations are made up of humans. And don't just imagine the C-suite when I say that. I'm talking about the developers and other highly-technical positions who may care very little about what's good for the corporation they work for over the long term. Those people also have instincts around and standards for what they consider decent behavior. Many of them (just like most people from most walks of life) will just stop listening if the person making the argument seems actively antagonistic upfront even if they would agree with the main argument that person is making.

Diplomacy does matter whether you like it or not. Especially before the person or people you're trying to persuade have heard your argument.