In 2003, Charlan Nemeth, a professor of psychology at the University of California at Berkeley, put that to the test. She had folks brainstorm a problem. One group was told not to criticize the ideas, the other group told: "you should debate and even criticize each other's ideas."
The group told to debate and criticize each other?
Generated 20% more ideas. And when asked for more ideas after the experiment was over, again, the critical/debating group produced on average of 7 more ideas each vs. the "don't criticize each other" group of 3 ideas each.
Criticism and argument didn't kill creativity, it created even more of it. Osborn's ideas, though well intended, don't exactly all work when tested.
I increasingly find that the best companies/organizations are simply those groups that now how to argue well.
I recently took over Highrise from Basecamp and so being a long time 37signals/Basecamp fan I have this weird "almost" 3rd party perspective now getting to see how things work on the inside.
The early founders/employee trio of Jason Fried/DHH (the co-founders) and Ryan Singer argue. A lot. It was surprising at first. It was a handful of months before launching their latest version of Basecamp, Basecamp 3. And they were in a conference room, and though all the walls in this Basecamp office are made of sound dampening cork, you could hear them arguing. Strong opinions about some feature that was necessary, and someone else thought wasn't. When they broke for lunch, you could feel the heat come out of that room.
I went to lunch with them and it was like no argument even happened. We had a pleasant, fun, meal amongst friends.
And I keep seeing this in the way the chew on their ideas. Nothing is sacred. But they realize how talented each other is and the rest of their team. There's nothing personal about the arguments. A huge reason I think their stuff is designed so well is that the stuff that stands the barrage of attack is the good stuff. The stuff that doesn't gets iterated on or thrown out and the stakeholder moves onto something else.
You hear a lot of this at Pixar too amongst the creators (http://www.fastcompany.com/3027135/lessons-learned/inside-th...) and even when Catmull had to argue with Jobs http://firstround.com/review/Spark-Creativity-with-These-Tip...)
So, want to get more creative and have better decisions. Probably don't go the route of censoring argument; get better at arguing.