Books are reflections of their times- an innocent illustration in one decade might be regarded as prejudicial and offensive in another.

While I've never been a fan of Tintin myself, the group does need to admit that the illustrations in the comic/graphic novel are not unlike the illustrations in other books that came before and after it.

One of my favourite contriversial books would come decades later- William Steig's Sylvester and the Magic Pebble. A sad but later heart warming story that can teach us how we need to be careful what we wish for... as well as what animals we choose to depict policemen [pigs not a good choice], food the animals should eat [alfalfa sandwiches might be construed as something else] and parents should always watch over their children [and not stupidly assume they are rocks, which could be symbols for drugs]... but it's such an innocent story! ... and don't get started on Maurice Sendak