I think it's cuz people get forced into thinking in binaries by propaganda, ex.

- black / white
- gay / straight
- right wing / left wing
- skinny / fat
- trans / cis

the majority of people are somewhere between the binaries, floating back and forth depending on the day.

either that, or binary thinkers have worms in their brains that force them to feed the division machine |ヽ(*￣▽￣*)ノミ|