I have 2 kids over 10 now, and I've been thinking about all those subjects that aren't covered in your typical Homeschool course:
vaccinations: why not to (teach them how the # of vaccines has skyrocketed since the 80's, now everyone is allergic, autism epidemic, etc.)
Teach how the FDA can't be trusted: ex-employees of company that created Aspartame end up (revolving door) at the FDA, etc.
Why growing your own food is better, what's wrong with Agri-business (watch "Food, Inc")
The system of "Corporations" in the United States - they have all the rights of a real person, etc. I saw one interesting documentary on this.
Monsanto and Bayer are evil -- literally Nazi level of evil
The MAINSTREAM MEDIA - how it lies, its liberal bias, etc.
What happened at Vatican II, the Crisis in the Church, history of Archbishop Lefebvre, etc.
REAL Economics: sound money, Gold, fiat currency, the circumstances how we got a Central Bank in 1913 (Christmas eve, passed with skeleton crew), inflation, hyperinflation, how today's money system works, practical applications of all this to our daily lives (little debt as possible)
Why homeschooling is critical; the evils of public schools
What's wrong with American imperialism - what is a Neo-con? What's wrong with the Patriot Act, the truth about 9/11 (and Pearl Harbor, the attack on the USS Liberty, etc.)
The truth about Judeo-Masonry, Freemasonry in the modern world
What is Liberalism?
What's wrong or unreal about certain Sci-fi topics (time travel, aliens, AI, etc.)
Catholic apologetics - especially arguing for Tradition against Novus Ordo-ites.
Arguments for Genesis account of creation, and how to debunk Evolution (I have this subject pretty well covered...)
And even to bring them up to speed with the last 5 years: The insane march to the Left, transgender movement, gender madness, etc.
Human Nature class - how men and women work psychologically, what to watch out for as a man and as a woman (listen to Abby Johnson explain what got her into abortion: it started by wanting to be pretty and attract boys attention)
Annette: A soul in Hell (note how the lost soul wasn't a murderer, thief, or even a whore! She was just VAIN and didn't pray. VERY scary!)
Now that I think about it, Bishop Williamson had the same thoughts as he was faced with forming a bunch of Seminarians who needed to be inoculated against the Modern World's errors. I have the same desire, only for my biological children instead. Same motivation though.
They need to understand WHY we do all the things we do, JUST WHAT IS WRONG with the modern world AND IN WHAT WAYS. If they can see the evil for themselves, they won't have to "trust me" on it -- they'll freely choose the same actions I have chosen.
I'm just looking for things to add to this list, ideas for how to teach these things, Youtube links, videos, documentaries, etc. because I need to start a real collection of these materials. It's time for me to create an out-and-out curriculum for "understanding the Modern World" because ignorance is NOT bliss.
I shudder to think where I'd be today if Thomas A. Nelson hadn't told me about Jewish machinations to control the money supply, and how they parlay that control into control over our choices and our daily lives (no homeschool, can't afford it! Wife has to work, etc.) I decided as a teenager I was going to minimize how much interest I paid. It worked out very well for me.