To me it's more interesting to look for messages about conquest or genocide in a cartoon or comic book. That's something we may not have heard before.
But to lay a guilt trip about "horrific abuses" and "genocidal practices" on people...I don't know about that. I'd like to see a study about how effective this approach is.
Remember, the goal isn't simply to tell people how bad things were and are. It's to get them to feel and act sympathetically toward Indians. The two goals aren't the same, and the first may negate the second.
For more on the subject, see Native Documentaries and News.