As children's writers, we know that stories shouldn't have a hit-you-over-the-head-with-an-iron-skillet moral. And we know that we shouldn't make our books into political tracts.
But, on the other hand, this family has done quite well for themselves over the years... (250 books?!?!?! 120 still in print??)
I liked them as a kid, but I'd never buy them for mine.... There are much better books out there that are more entertaining and less preachy.
(A current favorite of ours is The Shell Woman and the King by Lawrence Yep. We got it from the library-- the story is great, with a good balance between scary and gorgeous....)