There has been instances where the pilots have had to slam on the brakes, and just like in your car, if you're not restrained, it may well hurt.
Absolutely right!
That's the real point at issue.
And at last, the Government has realised how serious it is, and is introducing emergency legislation to enforce the carriage of staff on all buses and trains, especially local buses operating in heavy traffic, whose job is to make sure that no-one gets hurt by standing up, or, God Forbid, moving about until the vehicle has stopped and the driver has switched off the seat belt sign. These signs are being installed in all buses and trains as we speak, as are the seatbelts themselves, which until now no-one realised were so necessary.
The Government understands that the risk of the brakes being slammed on is even higher in these vehicles than it is in a taxying aircraft (where it happens on a daily basis) and that therefore people need protection from their own thoughtlessness, in the form of a uniformed school-leaver telling them it's all for their own good.