And exactly how are you certain, Wavemaker, that the passengers "knew" that the driver had been drinking?

I did not see that tidbit in ANY of the stories reported within this incident, so unless you were there, and heard it yourself, that the driver had been drinking before boarding said vehicle, well, your statement is presumptuous at best, and reprehensibly forgiving the driver and passing the blame unto the passengers that died or were injured at worst.