Actually in the area of creativity and productivity Ive seen many an argument for the contrary to what you say. There is one company in particular, (a large privately owned defense and hightech corporation in the US), where the owner more or less encourages his different divisions to compete against one another for contracts. This drives the individual teams creativity to the overall benefit of the company.
Factions and gangs are only negative when their competition is unfriendly or underhand. Proper open faced friendly competition is a stimulant to open mindedness, productivity and creativeness.
<Elian> And I do take a kind of perverse pleasure in having an OO assembly language...