Many 1 star reviews mention obscene images, those reviews are straight up lies. I'm not sure who paid these people to write about this supposed Lincoln Washington bit. They are very clean. Nothing vulgar, or sexually related at all.
Seems like people either love or hate these books. Not a whole lot of in between. In our world today where there are so many people trying to tell our kids what to think, these books help them learn to think for themselves. They teach the power of kindness, how money works, learning to be resourceful, and in general how to be good people, plus so much more. If you're not for teaching kids to use their own brains, then these books are not for you.