Isaiah 34:8 "For the Lord has a day of vengeance, a year of recompense for the cause of Zion."

This chapter of Isaiah tells of the devastation God is going to allow to fall on all nations - "For the Lord is enraged against all nations, and is furious against their host, he has doomed them, he has given them over for slaughter." (Isaiah 34:2). The day of vengeance that is coming will affect the whole world, and it will be "recompense for the cause of Zion." In Isaiah's time, Zion is the chosen people, the Israelites, the ones who were set apart. Now it is the baptized and the Church.

When God sees the world so evil that even his faithful and his Church are suffering terribly and being led astray, He will eventually act to save them and set them back on the right path. God did not create anything in order to destroy it, but sometimes we bring such evil into the world that destruction is the only way to cleanse it. It's like knocking down a house that has rotting foundations and is infested with vermin in order to build a new, habitable one.

Because Isaiah is speaking to the whole world ("Let the earth listen, and all that fills it; the world, and all that comes from it." Isaiah 34:1), and the promised destruction is so vast, this chapter is sometimes thought to foretell not only the immediate devastation, but also the last day, the Great Tribulation, in which "the skies [will] roll up like a scroll." (Isaiah 34:4). It certainly is describing a monumental destructive event, and God wants the entire world to be on notice. It seems to me that different iterations of the final day's destructive events echo backwards through salvation history. There are many times a given people, including the Jews, felt that their entire world was collapsing, indeed there are many times entire civilizations and nations have been destroyed. In the days of Noah, the world was destroyed by a flood, with God saving only Noah and his family.

Right now,  I would be very surprised if God was not angry at most of the nations of the world. There's so much evil, and most of the world leaders are excusing, ignoring, or even promoting it. So it's not surprising that most people feel a sense of impending doom. Even if people have not read Isaiah, they know history. They know what happens when evil is allowed to thrive: that God will have His day of vengeance, His year of recompense for the faithful. It is only a matter of time until we have ours. It won't be pretty, but it is clearly necessary.