The correct answer is - The insane live in a reality of their own.
The narrator's reality isn't the same as the old man's reality - this is because the narrator is insane. However, he wasn't always insane - what drew him to madness is the old man's 'eye of a vulture.' He became fascinated with the eye, started hating it so much that he wanted to kill the old man, which he did. After that, his madness didn't go away - it just grew stronger until he admitted his crime.
In my opinion, there are two possible reasons.
First, the government probably does not think these guys are any kind of a threat to them. I mean, so what if there are some people out walking around when no one knows they're there? It's like the thing about the tree falling in the forest with no one around.
They were kind of the “trial run” for integration. They caused a message to be sent to the public that integration was happening and the public would accept it, and if they didn’t accept it the government would quite literally send the military to back up the law and new way of doing things.
After the Little Rock Nine began attending a previously whites-only school, it was made VERY explicitly clear that integration was here to stay and nothing would change that.
Hope this helps.
This should be a writer's opinion
That is because it might differ based on who was talking. Some might disagree that it has become run-down, or some might say that it has become such way before "just recently".