If you get run over by a car or bicycle while trying to board a bus outside an official station, or if you trip, the bus company is liable, and the driver will be in very big trouble. Also, wehret den Anfängen! If they started doing this, it would set an example: it would make it very difficult to keep the schedule, and would invite people to just walk into traffic to busses stopping at a red light.
I see it like this:
Me: I'd like to get out here please.
Driver: But it can be dangerous...
Me: Noted. Good thing that is not your problem.
And when I am hit by a camel while departing the bus, that is my problem also. But of course, most cultures do not support this line of reasoning - you need to be taken care of weather you like it or not. This approach is well tolerated by most people, but saddens and irritates people like me.
> it would set an example
No, it wouldn't. This type of logic only holds if we consider that drivers are automatons who can not analyze risks by themselves. Give the drivers autonomy to judge whether it's safe or not to deviate from the scheduled route.
I rather have a driver signaling me "No, I will not open the door now because I don't think it is safe" over "No, I will not open the door now because I can't break the rules". It makes me think of the driver less as a person and more as a brainless cog.
da könnte ja jeder kommen (then everony tries that, very loosely translated)