Iif they are banning Enid Blyton presumably parents are banning most fairy stories, such as Red Riding Hood etc ? And it seems like a double standard to allow Roald Dahl, considering the content of his books!
Before you know it you will be banning half of children's literature.
As some posts have said, explaining that these are stories, so not real, is all that is needed. The explanation about how methods of bringing up children have now changed, can come later; after all, if you are going to have that discussion in all honesty you would have to say that physical punishment of children ( and adults) still happens in some cultures.
Presumably you will allow schools to teach history to your children, much of which includes far more brutality and devastating violence? Part of growing up is to learn gradually that attitudes, customs, opinions change over time - and not always for the best.
Aside from that, if you're unsure what books to buy for children there's a good website where you can find synopses and reviews of books and a guide to age suitability.
It's www.lovereading4kids.co.uk
Note the number 4 instead of 'for'. Amazon is also useful if you know what book you want to find out about, as they include reviews.
Please please please encourage reading - so many children only encounter ipads and tablets these days, even in school too.