Secondly, over the course of my 16 years of software development, I've found that when a I get treated less of a human (e.g. boss is barking orders, denied vacation, etc), that most of the time, these issues are rarely directly confronted. These confrontations create mental roadblocks in my head; all of the sudden I'm less productive/creative, lethargic, generally less excited about my work.
When a boss cracks the whip for employees to "work harder, faster!", it results in these subtle, mental withdrawals that are hard to pin down but are definitely costing the company money. Internal resentment results in a subconscious "fuck you" that most bosses may not even realize is occurring.