I never interpreted her saying focus only on yourself and maximize your own happy. But rather know yourself. To me there is a big differences in understanding who you are vs only doing what you want at any expense.

This is too simple, but knowing I want a piece of cake does not mean I should or will eat one.

She is railing against the types of people that are so goal driven to a point where it becomes an obsession. She seems to think that over doing(which is what that is) stems from a poor understanding of who you are, and/or surpassing your own needs. For instance opening a local store. It's successful, makes enough money, but instead of being happy(your needs are met) you open a chain, take over the state, then the country and so on. Or the empty nester that now has no children to focus on has nothing to do, no skills to do anything, and no idea what they actually like to do. Since their entire world was built around someone else.

Also, never let the worst of a group define that group. If they are the worst they probably aren't following the actual ideology.(clearly this thinking fails with Nazi's or other extremists)