The relevant sections for these comments:

https://en.wikipedia.org/wiki/Strauss%E2%80%93Howe_generatio...

https://en.wikipedia.org/wiki/Strauss%E2%80%93Howe_generatio...

Basically we've been in a "4th Turning" for about two decades, and the 4th turning typically ends in some sort of crisis (hence the name for it, "Crisis"): Great Depression/WWII in the previous one, the US Civil War before that, the "Age of Revolution" before that, etc.

The idea behind it is lessons learned last until the people who lived through the previous one die. So the 4 "turnings" repeat every 80-100 years, and some sort of major crisis is expected around now - hence talk of another Great Depression or WWIII.

I don't see what GP means by "hijacked", GGP is pretty much a direct reference to exactly what it talks about.

Aside, this meme is based on this theory: https://knowyourmeme.com/memes/hard-times-create-strong-men - "hard times" represents the 4th Turning, though it's oversimplified, which makes it not really a great match.