I come from a somewhat similar background. I work in marketing and I am somewhat of an amateur economist.
I agree with you about the strawman. But many economists or more commonly, people with economics in their backgrounds take this sort of a view. They like to distil things to an economics "story." Sometimes this is a great tool. Sometimes this loses important info. Economics training does come with the danger of this kind of mistake though. I heard that there was a serious divide between students and old timers about Ostrom receiving the Nobel (the students didn't like it).
One "story" they (the against camp) told was: If being good is more profitable, companies will do it without being told. That's capitalism, nothing creative about it. If it isn't more profitable and they do it, they are forcing shareholders to contribute a charity of the company's choosing.
Another was the one I mentioned above. If you take an economics graduate, you may find that they're not sure what make of a world where getting customers to choose you're same price, same value product is the difference between non-starter & Unilever. It doesn't make sense to tell this story with the basic vocabulary of microeconomics.
In any case, some essays published in the book make this argument. I don't mean to suggest that all or even most economists would take this view. Great economists (like great anyone) are empowered, but not restricted by their tools.