They sell out pretty cheap. If you have barely marketable skills, do you want to get pushed out of a $150,000 government job with gold-plated benefits and a fat retirement plan?
These guys go along to get along.
And who is more of a threat to these guys - a tea party member sitting in the town green demanding lower taxes - or a terrorist? The tea party guy wants to CUT government jobs and power. If the terrorist blows up a bus or a building, the FBI will demand MORE money and authority.
For the average FBI guy, its a no-brainer.
Excellent point