I largely agree with what you're saying, but I do believe that making an effort to be somewhat positive can have positive effects. Too much negativity in a workplace can be toxic and can have a paralyzing effect not unlike depression at the individual level. It seems a common retort around here would be, "just find another job," which is not a bad idea, but it's not always that simple.

I appreciate the link to the Ehrenreich talk. Her point on the anesthetizing potential of too much positivity is a good one. Realism and dissent are important for productive change in the workplace. But dissent can often be accompanied by a whole lot of pessimism and negativity (as she mentions), which isn't necessarily good for anyone. Striking a balance is important. As is often the case, it's a matter of moderation... which brings us back to that bold text.