Interesting article, even if it was written over half a decade ago.
I don't really see how the current range of DC books are aimed at kids at all. The violence can be quite confronting. Batman in particular often has quite graphic violence and gore that I personally find a little tiring (and I'm no prude).
The DC Animated Movies are also surprisingly violent, and I bet more young people are watching those.
So yeah, I think they're too violent and it often isn't necessary.