The point being made in all of these episodes is that Israel is in the presence of Yahweh, and they owe him praise and thanks for what he has done and how he has provided. Grumbling about circumstances, the kind of food, or who is in charge directly attacks the one who sovereignly orchestrated the circumstances, chose this food not that, and appointed the leaders who are in place. Grumbling against Yahweh suggests that what he has brought to pass is not good, or that his choices were not wise, or that he will not be able to do what he said, or that he has not been faithful to his promises. Yahweh responds to suggestions that he is not faithful, able, wise, and good—which are at the heart of unbelief—with wrathful indignation. He is a consuming fire—even with Moses. (p.117)
How true is this for us today! Every circumstance, everything that comes to pass in life is sovereignly ordained by God. A lot of people are comfortable with that truth already but don't often consider it when the grocery runs out of the steaks that were on sale! Or when you go through the drive-thru and they got your order wrong. Every circumstance is ordained. Let's try not to grumble about the ones we don't like... I didn't turn out well for the Israelites.