I have always found it baffling -- completely baffling -- that in these high falutin' management schools folks never seem to learn that a workforce divided amongst itself will lose money. It might do OK for awhile in an externally protected market but the day of reckoning always comes. Fix the blame generates useless words. Fix the problem generates solutions.
Divide and conquer might work for some things, but never results in a particularly efficient workforce. And when competition kicks in, efficiency is what counts. Keeping it better than the other guy; having a quality product where folks enforce the high standards of the place and organization they love. Working as a team with justifiable pride in what they do and keeping it great.
Your job can either be something you trudge to simply to pay the bills, or something that is a fun and grateful part of your life. If it's the former, the organization loses its identity and kinda muddles along. Nothing particularly good gets done to make things better and fix things, and 'not my department' starts to kick in as the pipes start to leak and the floors accumulate trash. If it's the latter, the sky's the limit (hey, THERE's a slogan !) in productivity and potential. And folks WANT to be there and are actually happy.