If you're going to go apocalyptic, then society is two missed meals away from anarchy. If a solar flare wiped out the power grid, the half of the world not struck would have to step in to help the survivors, but even that proves my point to an extent.

You're moving the goalposts and talking about purposeful depopulation schemes. Then anything goes. What I'm saying, is that modern society is more robust because we have the ability to get resources from well outside our geographic area via a very robust transportation system.

Also, we are also more robust because there isn't such a diffusion of knowledge. There isn't ONE village blacksmith. Nobody knows all the steps, for example, to make a single #2 pencil due to modern capitalism, but since that production is not limited to one area or a few experts, the missing pieces could be filled in from elsewhere.

Think how WWII pretty much depopulated a large swath of Europe. The world, on the whole, was fine because of everywhere else. You would have to have a worldwide catastrophe that was long, and enduring to get the "dark winter" that this video shows.