Restroom Door

I wonder why all the restroom doors open inside… meaning there is a handle inside the bathroom. (Maybe I am not aware of the ones that open by pushing from inside, so let me know if anybody sees it!) You have to wash your hands and then you have to pull a handle to open the door. I hope everybody washes their hands,  but especially at a public restroom where they don’t look so clean, I hate to touch the handle. I wonder if there is any regulations about which side the door has to open, but I wonder if the sanitation and user experience was considered for designing doors of public restrooms.