The point about the Hari thing isn’t “plagiarism” in general – he’s not passing up other people’s stuff as his own but as stuff said to him. We therefore go away thinking what a marvellous interviewer he is, able to draw out the best and most articulate thoughts from the people he speaks to. So, more importantly, do his editors and the people who commission him to do more of the same. But as he says himself, the best and most articulate thoughts of his interviewees often come from other sources. As doing interviews is a major part of his trade, this particular practice is not "intellectual portraiture" - cheeky bastard - but something more like fraudulent conversion.
It’s also incredibly stupid because the stuff he’s converting doesn’t come from obscure academic sources but actually published books. He was bound to get busted sooner or later.