Why do builders put the garbage disposal on the tiny side of a kitchen sink?

We have a kitchen sink with a large side and a small side. The small side has the disposer. Try as we might we cannot get the kids to comprehend keeping food out of the large side.

This morning one of my daughters asked me why the disposer was on the little sink we never use instead of the large side where everything ends up.

Because I had no answer I am asking here.