Yes, let's pack people in a dense area where diseases and tempers can and will run rampant because THAT has never happened before.
Sorry, I refuse to live on top of other people. Housing is not the enemy of nature - housing that is not in tune with nature is. It is completely possible to build homes that blend in with nature without having to resort to ultra-dense, 5-story brick behemoths filled with people who loathe one another.
I see what you are trying to convey, and I agree with you to an extent, but density is not the answer to sustainable housing.
No bones about it, this is a good meme.