So you expected one train inspector to take to task and deal with a large group of, no doubt unruly, young men on his own, without back-up. Did you want to be complicit in this man possibly being seriously injured or possibly even killed?
What should have happened, is that he should have been able to radio ahead so that at the next station the carriage with those young men shuld have been met by a posse of Railway police, who could check their tickets and handout enhanced penalties for not paying (assuming that hey hadn't plus an enhanced penalty for non-cooperation with the train inspector.
The problem is the railway companies for not having proper procedures to support their staff. The problem is not an inspector, unwilling to put his personal safety above the costof a few rail tickets.