I find this whole vocabulary for describing your office environment (empire-builder, fiefdom, turf war, etc) to be incredibly negative. Thinking or your peers as bumbling warlords has got to make your time at the office a pain.
That said, I have not worked at a large company before, so I might think the same way in your shoes.
The problem is that in large companies, that is the way it works. Politics are an unfortunate fact of life just due to human nature.
In my opinion, the biggest reason why those upper management folks in big companies make those mistakes when they reorg is because they don't have a view of what happens in the trenches. The details are critical when determining whether a specific service can be provided by a specific group and be tracked by a specific system.
They don't get that a system's order database has a data structure that can't accommodate a new category of product types and a new way of doing work. They crunch the numbers, but the inefficiency lost from poor processes due to lack of understanding at the ground level makes those numbers meaningless in the end.
That said, I have not worked at a large company before, so I might think the same way in your shoes.