The last two comparisons are hardly fair, as both are depictions of the same legendary place, the land of the dead as seen through Mexican mythos. Wonder Woman and Disney's Hercules both cover the Greek pantheon... would you say one is ripping off the other, or are they just using the same mythos background to tell stories? The second picture, where they each realize they are dead, is so common in any story that involves that sort of thing it doesn't count for anything. They aren't even similar. Manolo is looking at his bony hands while Miguel is realizing he's a ghost. Two different ways of saying 'Hey, this character is now dead'. And the first comparison? Two Mexican males playing guitar? Really? That's to much similar?
As far as the links go.. I'm afraid to say I couldn't read much of the second one. The site design and eye-searing color combination make it difficult and literally painful to read. What I could get though that that the author was angry about the appropriation of Mexican celebration in culture, since The Book of Life was produced by Mexicans, and Coco is made by Pixar. It's striking to me as an 'I want to be outraged' moment. It's not for me to say why other people are angry though. But I am not seeing the outrage.
Other than a common link through the Dia de los Muertos celebration and imagery, the stories seem quite different. I don't think Pixar is ripping anything off here. They are telling a different story that shares some themes and imagery because of a common link through Mexican culture.
