The whole nation guilty

1 Chronicle 21:18-31
The angel of the Lord ordered Gad to tell David to go up and build an altar to the Lord on the threshing floor of Araunah the Jebusite.
Araunah saw the angel; his four sons who were with him hid themselves.
David approached, then when Araunah looked and saw him, he left the threshing floor and bowed down before David with his face to the ground.
David insisted on paying the full price.  David won't take for the Lord what is Araunah's, or sacrifice a burnt offering that costs him nothing. David said, "The house of the Lord God is to be here, and also the altar of burnt offering for Israel." So David paid Araunah six hundred shekels(7 kg/15 pounds) of gold for the site.
The threshing-floor was a flat open space where the sheaves could be spread out. Oxen pulling studded sleds loosened the grain, which was them winnowed簸揚 by tossing it into the wind. Ornan=Araunah in Samuel. Difficulty may have arisen because it was a foreign name.
Why?
The whole nation guilty: National solidarity is a fact. When the king as leader sins the people suffer. The same is true of leaders and nations today.
Hid: Perhaps in the cave beneath the rocky floor, which now lies under the Dome of the Rock mosque清真寺, erected豎立 on the Temple site.
2 Samuel records the price paid for the threshing-floor, this verse apparently the price paid for the whole site.
People saw the Lord or his angel is terrified and hide themselves. When saw the king they afraid his authority and come out to bow down before the king.
How?
To be a leader have to very careful to his mind and behavior, so as a Christian is ambassador of the Christ.