I disagree. I think that there will be some people who will be creative no matter what. There will some people who won't be creative no matter what. And there will be some people in the middle who could swing either way.
As an example: I think that Steve Jobs would've been creative and ambitious no matter what. But I don't think that Wozniak would've been ambitious if it wasn't for Jobs pushing him.
Certain environments foster creativity and experimenting. US colleges are full of weird intellectuals with crazy ideas. OTOH, Your typical, say, police department (or most government agencies...) is not.
The environment that we live in will tend to sway people in one direction or the other. (... just look at the environment of S.V. or YCombinator...)