In some versions of the Bible, what is listed here as verse 21:1 is listed as 21:6.

This prophecy is directed against Jerusalem and Judah. The time frame is just before the final destruction of Jerusalem and the Temple by the Babylonian forces under Nebuchadnessar.

<<THE RIGHTEOUS AND THE WICKED>>: When disaster comes it hits everyone. Doing evil brings evil, doing good brings good. Whatever comes affects everybody.

Eisemann (Artscroll) brings commentaries that this was referring to all nations south of Babylon not just to Judah. The other nations were to be punished because they rejoiced at the downfall of Judah. The gentiles did not realize that the Temple was beneficial for them. On Succoth seventy bullocks would be sacrificed, one for each of the national groups of humanity descended from the seventy descendants of Noah enumerated in Genesis 10. Eisemann says:
"The gentile nations also have an inner core of holiness. If they had only realized it, the Divine presence of God in the Temple could have been the focus of their own spiritual strivings. More than for Israel who, through their Torah, are themselves a sanctuary for the Divine, the Temple was an indispensable condition for the spiritual development of the gentile nations.."

FURBISHED i.e. polished up.

<<ALL THE PRINCES OF ISRAEL>>: According to the simple meaning this is referring to the Princes of Judah who is also termed "Israel".

<<JERUSALEM THE DEFENCED>>: Jerusalem was built up with mighty fortifications. Its inhabitants considered it impregnable. This was not the first nor the last time they made this mistake.

 Archaeological findings have confirmed these means of sorcery. Baked clay models of livers have been found with directions for divination, i.e. a kind of do-it-yourself sorcery directory.

British Israel writers interpreted this verse as referring to the throne of David that would be overturned twice or thrice: from Jerusalem to Ireland to Scotland to England. The word translated as "overturn" in Hebrew is "iva" which more correctly means "make crooked". It could also be translated perhaps (as others say, see Ezekiel 21:32 in most versions) as "perturb" or "make desolate". I guess you could also translate it to say "turn aside towards" and therefore by extension as meaning "overturn"? Even so, to propose a strong doctrinal point one should employ clear, strong, and simple passages as we usually do.

The people of Ammon participated in the downfall of Judah. The Babylonians would later destroy the Kingdom of Ammon and drive away its people.

The point should be made and questions should be asked: This prophecy and others like it were referring to historical disasters that overtook Judah and Jerusalem. There is a principle that all these prophecies have some application in the End Times. Are they referring to Jerusalem in the future? or to London? or Washington? Or something else?
Rembember Y2K? We had a friend and supporter in the USA who really believed that just after midnight of New Year's Day in the year 2000 disaster would overtake America. Everything would break down. He had a caravan and supplies staked out somewhere in the west and he was all prepared to depart to his place of refuge. I am speaking of a good, intelligent, well-informed person. He was not the only one to be taken in by the scare-mongers and conspiracy buffs. He was not rich and I suspect that he invested quite a sum on his "survival kit". Someone should write a book about it.
The sages said that if you are planting a field and you hear the Messiah is coming, finish what you are doing and then go and greet the Messiah.
Even so, disasters do occur when no-one expects them.
God wants us to do the best we can with what we have for our own sake, the sake of our dear ones, and those around us and part of us.