For the humans of the first cave of myths dungeon base aspiration, apart from having to consider how to shorten their title, they also had to consider when would the orc make a move.
They wanted to move bases but what happened if they got caught with their pants down? What would they do then? Under such a circumstance sending a few scouts was common sense.
Unfortunately, a few was really all they sent. If the messengers were killed they would still get the message. Plus, the scouts that were sent knew what they were getting into. They accepted their slim chances of surviving.
After having suffered through so much already, what else was there to lose? The people that stayed behind were all older gentlemen and gentlewomen so they were also more accepting of death and mature than the ones sent to transport the drop item.
Still, sometimes getting no news was better than getting bad news.