From my experience, NIH is invariably the default reaction of most large organizations to outside input. Even if such input is well intentioned - and requested by the organization itself - the knee-jerk tendency to circle the wagons and stonewall is just too ingrained. Because you're far less likely to be punished for inaction than you are for doing something, refusal to take action is often the smarter strategy in a corporate setting. Dilbert referred to this behavior as "Learned Helplessness."
Bug identification is much like whistleblowing. The very businesses encouraging you to "participate" usually prefer that you don't.
In management circles, such behavior is generally seen as an early indication an organization has passed it's prime and started its decline.