You answered it yourself. Nyan cat is a little pop-tart kitty who runs in rainbows with NO purpose what so ever! People love it because its "funny", "cute", or plain old useless!
It even has its own couple of apps in the app store! So if you want a popular youtube video, post one that is very, well, stupid! LOL.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.