I've been at the same company since 2007, and although this isn't government work, it sure works that way. For anyone to be fired, you need solid evidence that the company has lost a good sum of money. That creates an environment where there's little trust among the lower end workers and the higher tier ones. I stay because I make great money for where I'm located, the job is stable, and if I need to just take off for a doctor's appointment, there's no issue as long as I get my work done.