Roald Dahl needs to get over himself

I understand an author has a right to their work, but there is a difference bwetween what will work in a book and what will work in a movie. and none of dahls stories are shall we say, "the lord of the rings" or something epic like that. he writes creepy childrens tales. When I read that he was apprarently "outraged" at the ending change of this movie that he never wanted people to make his books into movies again, I felt like man you need to get over yourself! I MUCH prefer the ending to this movie, not every movie has to have an upbeat ending but this movie needed it, and the test audiences were correct. I miss when they used to do that, get the publics opinion. a dark ending would not work for this kinda movie. sounds like Dahl was just a snob who needed to get off his high horse and realize the filmmaking process is not the same as writing story on paper. film still came out great and people loved it so why is being so pissy about it?