The kinky posters aren't too unusual. After all,he was a teenager. You would think the bomb factory would be a good first clue that things weren't going well,wouldn't you?
It's a combination. Before I was a teenager I had a bomb factory. Kid's like fireworks and it was legal. The old man just cautioned to use paper, not glass, so no one would get hurt. I also had a strong love of Freedom and an extreme dislike(hatred) for nazis , communists and criminals. This kid's old man was an airhead and so was his teachers for ignoring his school presentations.