This guys were framed as villains but technically they didn't do anything wrong, some guy was standing back when looking at a young girl risk her life, is the way it was done and thei rbehaviour that made them appear like some villains, and of course pretending she goes with them, okay to denounce a possible slave farming, but they only wanted her because she is a beauty, that was more clear.
The reason because MC is unknown when being high rank is simple, he is not a conqueror, he is not a monster slayer, a hero or a saviour, his job was stone mining and retrieval, he brought fuel.
When a important job is not much lauded, who in this topic know the best oil company in the real world and the face of their best emplouyee or CEO? The only one I can think of is Bruce Willis character in Armageddon, that again, isn't the real world.
To end it, in this work a dungeon explorer is seen as a low tier job in Japan, for freeter and the likes.