From my imperfect memory;
Previously you could kick passengers from your ship, regardless of how many were on board. Then the feature was removed because it made no sense that you could just click a button to remove them without a "fight", especially since there was a second option that involved that (sort of); A/E.
It is the responsibility of the owner of an entity to make sure they trust whoever they give access to, as a prankster can easily deprive you of the ability to fly your YT-1300 by simply filling it up with NPCs so you cannot get in. Of course it is possible that the owner can do that in a moment of weakness too. There is a difference between not being able to use your ship and not getting all the passengers off, so the button was re-introduced to, idk, ease off on the cries for help to the admins?