One of the teachings I heard several times from a few different sources essentially said "as goes the Church, so goes the nation." I think I saw something similar as I skimmed through the writing referenced in this thread.
There's a reason these trends are what they are. What exactly is that reason?
Sorry - I did not notice that question mark at the end.
Well... better late than never.
"Love of many will grow cold" Matt 24:12 - is a "prediction" about the future - made by Christ while living under the brutal Roman empire.
The society of sinful man worsens over time and then was destroyed by a flood in Genesis 7
Then this one worsens until it too will be destroyed -- it will be destroyed by fire according to 2 Peter 3.
It is an ever worsening condition that gets temporary "reset" in the form of Christian revival and expansion of the gospel. But at some point saturation is reached - the gospel will have gone to all the world and the general trend of descent into self-destruction overtakes the whole of it.
Rev 14 - the final warning is to be given to mankind
Rev 15:8 - probation for mankind ends - Christ leaves His work in the heavenly sanctuary
Rev 16 - the seven last plagues of the "Wrath of God" fall upon mankind
Rev 19 - the appearing of Christ, rapture of the saints, destruction of all the lost 2Thess 1:5-11
And the result? Jer 4:23-26 "no human" left on Earth, only the ruined cities of Jer 4:25-26.
Once the 1000 years are over - the Holy City comes down - all the saints return, the wicked are raised to life and are judged.... then the Rev 20 Lake of fire event.
Then the New Earth of Rev 21.