If you say "we don't have office politics at our company" the reality is that you do have office politics and it's completely unrestrained due to the blind eye turned on it by "management".

If you notice that the cars you build tend to rust, and that water causes rust, you might say, "well, we're going to build cars that don't encounter water," and you'd be rightly laughed out of town. Office politics doesn't happen (or not) because the founders wrote it into their business plan. Office politics happens because offices are occupied by humans.