I like to imagine how the world, infrastructure, vehicles, electronic devices, buildings etc. would look like if most people on earth would be mobility-impaired. Then, considering how the world really looks like, it becomes obvious how even most basic notions of accessibility are lacking way too much. So much for a society fair to all.

This thought experiment can be repeated with other cases. For example, replace "mobility-impaired" with "autistic" or "trans" and see similar results.