To all the people who don't understand why this specific protagonist is so fucking dense, let's explore:
[ul]Allen was severely bullied at his fencing school. Not only the other students, but the teachers all bullied him. Think about how that would affect your self esteem.[/ul]
[ul]Allen then pushed the 100-million-year button multiple times. He was alone, with his own thoughts, for nearly a billion years according to the story.
[/ul]
Anybody would be mentally unstable after a single press of the button, but he pushed it multiple times. Think about it, a billion years thinking you're awful at something and just trying to reach the level of others.
I know it doesn't make sense to readers, but if you put yourself in his shoes you really start to understand why he thinks the way he does. It's definitely annoying, though haha