I've seen this at all large companies that I've worked for. I call it self-preservation mode. People feel like they have to justify why they are important as a cog in the machine so they restrict information to make themselves required. Keep the game going so I get my next bonus. It is hard to convince someone to take risks when their job depends on not rocking the boat. The worst part is that these people have convinced themselves that they are irreplaceable. The issue at its core is that you get what you optimize for.