I don't think so; I said marketing people frequently do bad stuff, which is not the same as saying they're all bad. I stand by 'frequently', because just look at how much terrible adware, clickbait, spam etc there is on the web. It's a Gresham's law-type situation.

Of course marketing people do a valuable job in terms of figuring out how to sell things and minimize the gap between producers and customers. But - just like engineers - there are lots of cynical and amoral people who work in that industry who make things worse for everyone else. By contrast, I can't think of any society that is suffering because they don't have enough advertising.