I discovered KC on 2012. I think my first thread was asking Bernd what he thought about feminism. That thread got 200+ replies before it was abruptly deleted by a mod, although my favorite reply was, "This is like asking the Muslim Brotherhood what they think of Zionism." Still makes me chuckle to this day.
My early days were complete and utter shitposting, particularly my infatuation with Dana Scully. Other threads of mine included American Power Hour threads for my fellow Americans to discuss their week, events / culture / politics in South Africa and gourmet stool / fine urine from female celebrities. Yes, my early threads were thoroughly puerile (although the South Africa ones were made in good faith; sincerely miss SaffaBrit) which led to wearing out my welcome, but I soon discovered several Bernds shared my taste in music. Around the end of 2013/2014, I dedicated several threads to Metal and Punk. The keinmetal scum were an unwelcome presence, but they all fucked off at the end of 2014 which made discussing extreme music much easier. That's when I dedicated several threads to RAC/Rechtsrock and never stopped. Two of the pals I made along the way was Metalpunk Catalan who now posts here and a gay Jewish dude from the Midwest who I haven't seen since the collapse of old KC. Neither of them shared much of my taste in Rechtsrock, but they certainly liked the non-political or lefty Metal I'd occasionally bring up.>>49794
We've gone over this before, but if you really want to blame any source for mainstreaming memes, Encyclopedia Dramatica would be the culprit. That site along with trash like forumwarz, Attack of the Show and other meme-based "entertainment" completed the imageboard-to-reddit-pipeline. Then came Know Your Meme and other such sites.
As to what led to KC's decline, the death of pure love was the first and most visible fracture in the facade for me. The annexation of Crimea accelerated the hostility on the board, and each subsequent year led to more enmity and less coziness.