Human nature

In the Israelites journey 'back' from Egypt to the Israel does sketch an interesting portrait of human nature.  While in Egypt they were moaning and grumbling but under their breath, for fear of Pharoah and his soldiers whips.  But in the desert they openly grumbled.  They knew Moses did not have a whip.  While as slaves in Egypt they had no freedom, had to slog it out the whole day;  but in the desert all that they can complain about is food!  They had no work, no hard labour but all that they can think of is 'onions and food of Egypt'!!  Really?

Basic premise: we grumble, even if we have everything;  even if we have to grumble of nothing!