I wasn't using the word "people" as a proper noun to address anyone. If I were, I would have used a comma after the word. I definitely wouldn't add a pause between the words, "think" and "would". Creating a pause there seems unnatural to me.
But you were distinguishing between those who are reasonable and those who are unreasonable. You are in effect addressing two distinct audiences. Without a comma, that distinction is unclear, even though the reader instinctively understands what you are talking about. To me it's only proper to use a comma to reinforce those partial concepts.
Creating a pause there seems unnatural to me.
Again, I disagree. If spoken, one would naturally separate the middle phrase with a pause, even if ever so slightly, to distinguish who is being addressed. At the very least there would be a slight change of inflection.