You're missing a bunch of things: 1) Property. Where would this treehouse go? Costs money to buy property.
Also, you have to pay property taxes, so you will need a job and income to do so 2) Building codes. If you're living in it, the government is going to require you to follow certain building codes. Not saying it's impossible, but it is costly.
3) Food and utilities. These things cost money 4) Sewer line. For the obvious reasons Now, you could go another route like the Unabomber and live in a cabin in the woods where nobody even knows where you are, and you could crap in the woods, and kill your own food.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.