- We don't know or its not possible to know what came before something.
- After Big bang, nothing (as you define it), doesn't exist to the best of our understanding.
We both seems to agree on this two key point. So what are you exactly arguing against?
"We don't know yet." is really the answer to whatever you are mad about. Krauss or pick-your-favorite-scientists doesn't really shy away from this fact.
Are you mad because of the wording "UNIVERSE FROM NOTHING", then you just judging the book by its cover.