Small Screen Superman (www.sssuperman.com) - my Superman fansite. Go there for blog posts, Superman hangman, Superman crossword puzzles, and more!
I think a lot of this is because Superman is the #1 mouthpiece regarding Krypton. He looks like a walking encyclopedia.... because writers rarely explore the limits of what he knows. He looks more knowledgeable than he really is when people only ask him questions he knows answers to.
Thats what makes me like the concept of Kara being the true guardian of Krypton history. She grew up with it and lived it. She knows its history, its politics, its customs. I wish writers would play that up more.
This is where things like Kandor come in handy. You have an entire city that would know the history of the planet.
Assassinate Putin!