You have two choices, one has a risk of 15 units, one has a risk of 3 units. The outcome is the same. You go for the risk of 3 units. As Kirk says, "risk is

You have two choices, one has a risk of 15 units, one has a risk of 3 units. The outcome is the same. You go for the risk of 3 units. As Kirk says, "risk is our business". Doesn't mean you don't need to minimise the risk to achieve the goal. The goal here is 1) Return the crew 2) Return the capsule and gather more data If those goals can be achieved with less by bringing the crew back on dragon, then that's a sensible move.