"Culture Fit" is just code for "You don't seem to care about what we care about, and you don't work as hard as us, and we're not sure but you may just not be as intelligent/creative/inspired/ambitious as us, or whatever, but we think your salary and the overhead of dealing with you could be spent more productively on someone else."
Agree with the overall point, but I think that's important to stress. My experience with people who embrace this "fire fast" thing has generally been people who don't understand the difference between their perceptions and objective reality; likewise I don't think that all (or most) understand the ramifications of their actions upon other people.
