Andhra Pradesh State Road Transport Corporation [Apsrtc] — bus departed without ensuring the boarding of passengers

I bought the ticket for vishakapatnam to vizianagaram non-stop express service at vishakapatnam bus station.
I went to washroom and came back to board the bus only to find no bus.
Next to me, another guy came in search of the bus - the same bus - and found the truth.
First of all, bus wasn't full and he took off. Secondly, isn't it minimum responsibility of the driver to ensure whether the passengers who booked the tickets at the counter boarded or not.
I bought another ticket and boarded the bus and the bus was close to half full and the driver got in and started the bus without even asking or checking for once whether all the passengers boarded.
Is it really hard to do once duty?