Sardine cans, oh no sorry Buses..

Why do the bus drivers here in Edinburgh seem to think that their buses are like the tardis? I've never seen so many people herded into small metal boxes before and only once in three years have I seen a driver turn anyone away from the bus because it was full. never mind the outrage against factory farming of chickens...maybe we should be outraged at how we are squeezed on public transport ...grr