Meh, I have never believed it is in my best interest to hinder someone else. I hope I never do. In general people who think that way often expose themselves as such. Who wants to work with someone like that? It may get you ahead in some ways, but I do not think it is the key to long term success.
I recall reading something awhile back about ways to get ahead, and it was super hard core. Stuff like "Think of people as the rungs on a ladder to your success". I thought it was satire at first.