(Which isn't to say it never happens, I'm sure it does, just that it's not the epidemic it would appear to be if you look solely at politics as she is practiced on campus.)
There's an old saying to the effect that campus politics are so vicious because the stakes are so low. When you get out in the real world and realize politics requires more than making statements -- that it requires building movements, and you need lots of people in order to build movements that make a difference -- you learn fast to either live with people who are mostly on your side, even if they disagree with you here and there, or you content yourself with writing blog manifestos.