I'm afraid I must dispute your first paragraph, and claim ignorance of the issues in your second.
There were several overt similarities between the "Help! Mom!" books and that example of Nazi propaganda aimed at children (unfortunately). One was as subtle as a baseball bat: Check out the exaggerated facial features of the Hollywood villains on the cover of "Hollywood's in My Hamper":
I wouldn't ask you to descend into that Nazi stuff again; I'm sure you recognize that particular genre of visual caricature as anti-Semitic and racist.
The written material conveys the same message of demonization of a particular group. You might want to check out the HM books a little more closely before you dismiss them as "not trying to persuade anyone about anything". The conclusion that they're not "aimed deliberately at indoctrinating children", might surprise the reviewers as well as the publisher:
Book Description
This full-color illustrated book is a fun way for parents to teach young children the valuable lessons of conservatism. Written in simple text, readers can follow along with Tommy and Lou as they open a lemonade stand to earn money for a swing set. But when liberals start demanding that Tommy and Lou pay half their money in taxes, take down their picture of Jesus, and serve broccoli with every glass of lemonade, the young brothers experience the downside to living in Liberaland.
From the Publisher
Would you let your child read blatantly liberal stories with titles such as "King & King;" "No, George, No;" or "It's Just a Plant?"
Unless you live in Haight-Ashbury or write for the New York Times, probably not. But with the nation's libraries and classrooms filled with overtly liberal children's books advocating everything from gay marriage to marijuana use, kids everywhere are being deluged with left-wing propaganda.
"Help! Mom! There Are Liberals Under My Bed" is the book conservative parents have been seeking. This illustrated book -- the first in the "Help! Mom!" series from Kids Ahead -- is perfect for parents who seek to share their traditional values with their children, as well as adults who wish to give a humorous gift to a friend.
Praised by Rush Limbaugh and hailed as "the answer to a baseball mom's prayers" by talk radio host Melanie Morgan, this book has already been the subject of coverage in The Wall Street Journal and Harper's magazine. Written by a self-proclaimed "Security Mom for Bush" and featuring hilarious full-color illustrations by a Reuben Award winning artist, it is certain to be one of the most talked about children's books of the year.
Amazon
I don't mean to be harsh, ER, it's not personal. If there's an edge to my response, it's because as I've been writing. I've been confirming my earlier impression by reading more pages of "Liberals Under My Bed" at random at Amazon...and gaack it is really and truly hateful stuff. The online excerpts make a big deal about copyright, so I won't violate theirs by copying any excerpts...but if you doubt me in any way, first go check it out for yourself.
I'm afraid I must respectfully disagree: It is entirely fair to compare the "Help! Mom!" books to earlier hatefilled propaganda directed at children. It's fair to make the comparison, but making a comparison isn't the same as saying that they're equal. What the comparison reveals is that they have qualitative similarities. That's the repugnant part.