I read it last night too. If he actually wrote all of it, and if he didn't copy and paste it, he put a lot of thought into every portion of it. It wasn't just a simple "I hate this, and I hate that". There was a well thought out structure to every part of it. I honestly couldn't for the life of me figure out the in depth review / analysis of every single component of his equipment, right down to his socks and underwear. I can barely find enough time to post on here let alone come up with 180 pages of that.
What I took away was he seemed very intelligent, very well versed in his mindset and why he thought what he did, and cold as it gets. I saw the 1 minute video and he didn't hesitate for an instant, didn't appear panicked, and never heard him breathing as if he was so. He identified a target and completely stopped, walked away, and apologized on top of that.
While I don't agree with anything he did, and a majority of what he wrote, he was obviously enraged by the current state of illegal immigration and what he felt it was doing to our country, and apparently many others. His disdain for this aspect has been echoed on many forums and in many circles.