Dangers may be political enemies in neighboring cultures, physical features of the area, a change in the area which might effect food supplies or any other number of factors. All pose a real danger and all may be made less dangerous if certain preparations are made. Without knowledge, the danger may strike and completely destroy. With knowledge, the effects or consequences may be lessened. Exploration also allows resources to be located.
Resources translate into power and success at survival.
Whether the success be financial, political or genetic additional resources are always a boon when used wisely. In any of the three manners, use of resources allows a heightened percentage for survival. If the resources have no immediate need, then perhaps later the resources will be used. Resources may be more than physical assets. Knowledge or techniques acquired in exploring or preparing to explore always filter from the developers to the general populace.