In terms of giving these to children - I'd argue that this is the parent's decision to make and that there are far worse things we are seem to be ok exposing children to, like advertising or social media.
while technically true this is also essentially wrong, if someone stops selling something for moral reasons then they are strongly implying you are immoral for acquiring the thing they have stopped selling; and it is a necessary component of the immoral that one should not have the immoral, transmit the immoral, commit the immoral or otherwise partake of the immoral.
Unless they donated the book rights to the public domain, they literally are telling you exactly that.