That doesn't make it any less correct.
Probably because most of the books you have read about it were kissing Nirvana's ass, or appealing to fans who like to kiss Nirvana's ass.
See, your post here is exactly why so many people consider Nirvana overrated. Cobain himself came out and specified what the song is about, and yet, Nirvana fans, who are so intent on putting Nirvana on a pedestal to which they don't belong, ignore Cobain's own words in order to justify their view of Nirvana as being so wonderful and "poetic".
It's not that deep, and it's really not that good of a song. And yet, you've been misinformed as to the meaning of the song, most likely because the alternate (read: made up) meaning of the song makes it seem "deeper" and more "introspective".
And that's why so many people call Nirvana overrated. Nirvana had some good songs, some songs that I even enjoy listening to today, but they were not as great as the Nirvana blowhards like to pretend they are. Which is what makes them overrated.