Its usually the way we train ourselves to behave in work environments. Spontanity only gets you into trouble. Nobody can be really trusted, everything better be documented.
Work kills the ability to make friends, because you see how all those former "friends" crawl over each other to backstab one another and get to the top of the pile.
Wow, I'm glad I don't work where a bunch of folks here evidently work. I've make plenty of friends at work and I don't see a lot of backstabbing and jockeying for positions.
I simply would not stay in a work enviornment like that.