I agree that it is extreme, but show me a person that said they have a perfect father or a perfect childhood and I'll show you a liar. Everyone has flaws and Gables have now been exposed. I think I admire him even more than I did before the article. I seriously doubt that he would have ever caused physical harm to his daughters. He just punched holes through doors instead. It's probably a great temporary stress reliever.
PS, I'll never say a word sideways about Gable. I have way too much respect for what he's done to put much emphasis on his minor drawbacks. His internal struggle makes him even more interesting to me.