By definition, leaders have too many responsibilities on their plate. This is what distinguishes leaders from non-leaders – the ability to think it through...
In the desert with little water and scarce food, it is a struggle to survive, and that can lead to discouragement. God never wanted life for Jewish leaders to be such a struggle when they came back from Babylon, but they were measuring their problems against their own puny strength rather than measuring them against our mighty God. They forgot God is much bigger than any struggle we face.