Sam: Because the Rabbonim said so.
Bezalel: No one is coerced. They don’t have to take the bus. They could take a different bus or train or drive or car service. And it is no more “coercion” than being forced to use the non-handicapped seating. Or being “coerced” to only use the men’s room. Additionally, its either segregated or not. If the Rabbonim or Poskim of the owners determined it is to be segregated, that’s the way it was setup.