Tolle addresses the ego in much detail, therefore, many people think he and other's like him, are trying to get us to kill off our ego's and/or at least subdue or repress them.
They are not saying this at all, but that we must realise they are not us, like knowing your dreaming while in the dream.
Our ego's are essentially our validating mechanism. We can't experience most stuff without it. The trick is to know it's not us, it's a tool just like thought and emotion.
Wonderful, wonderful tools, but tools none the same
Judge