this is what happens when people who only listen to rap try to comment on other genres
what songs did Nirvana talk about politics bro?
You quoted a whole bunch of sh*t and made it look good

, but
none of it backs up your claim about his music not touching on politics. Not to mention you didn't provide any sources for those "quotes"
WTF does his "phrasing on the album" being "difficult to understand" or the "clarity" of his singing not being "paramount" have to do with his political stance?
Now if this quote would have said: "Music comes first and
everything else happening in the world comes second" then I would have been like
But just because he stated "lyrics come second" you assume he takes no political stance in his music? A lot of Jazz and Classical music have NO lyrics at all yet a lot of people still believe the musicians were making social/political statements via their instruments.
Kurt did play a instrument as well, so it isn't odd that he is just as passionate about the instrumentation aka "the music" as he is about his songwriting.
Maybe he complained about rock journalist because they belittled the message in his music sort of like you're doing now
Since you want to quote sh*t though how's this for a quote...
Cobain struggled to reconcile the massive success of Nirvana to his underground roots. He also felt persecuted by the media, comparing himself to Frances Farmer.
He began to harbour resentments for people who claimed to be fans of the band yet refused to acknowledge, or misinterpreted, the band's social and political views.
A vocal opponent of sexism, racism and homophobia, he was publicly proud that Nirvana had played at a gay rights benefit supporting No-on-Nine in Oregon in1992, in opposition to Ballot Measure Nine, a ballot measure, that if passed, would have prohibited schools in the state from acknowledging or positively accepting LGBT rights and welfare.
I admittedly stated that I don't know much about him, but since you on the other hand claim to be such a fan and so well cultured in "other genres", how does it feel to know that someone who you know so much about

would have resented you because of your refusal to acknowledge/misinterpreting of his social and political views?
And to answer your question of which Nirvana songs talked about politics.. one of the lyrics in their most notable song,
Smells Like Teenage Spirit is:
"Our little group (tribe) has always been and always will until the end" - Kurt Cobain
Is it so hard to believe that he could have been talking about how a small group of people aka the 1% control politics, money, and power? Just because he didn't say "this song is about politics!" at the beginning of the song doesn't mean it isn't.