I need help from Gurren Lagann fans

[jmf6401]

No matter how many times I watch it, no matter how I look at it, I can't see the ending of Gurren Lagann as anything other than a bad joke.  Simon goes through all that suffering only to wind up with nothing.  Not only that, he acts as if losing Nia isn't that big of a deal.  Nia was kidnapped, tortured, and ultimately died for nothing.  Her death accomplished nothing and it wouldn't have made any difference to the plot if Simon had left her to die.  If that wasn't insulting enough, Rossiu not only escapes punishment for all he did but is able to live out his life with the woman he loves.  If Simon didn't deserve that then what makes Rossiu worthy of it?  Why doesn't anyone else realize that the only thing Gurren Lagann proves is that the Joker was right all along?  What do you know that I don't?