These doctors are shooting all the dogs (metaphorically speaking of course) but they're shooting all the dogs because the organization they work within has incentivized that behavior. It's not a top down policy to shoot (metaphorical) dogs. It just so happens that if your top down policy is to suck at everything then there's no motivation to stop the people at the leafs of the organizational tree from shooting dogs (denying disability wrongly as a matter of standard) practice. I think this is incompetence, not malice. The people actually misbehaving are too far removed from policy for this to be malice.
It's curious that you can see how incentives shape the behavior of some people, but not that of other people.
It’s not about people at the top responding differently it’s about the flow of influence. If 20% of the people at the bottom behave poorly the other people at the bottom have little influence. That changes at the top as it’s easyer to monitor a small group of people and their actions are more documented.
Ex: A cashier can fail to scan items for their friends at checkout and without any form of paper trail. The CFO can do more harm, but it’s harder for them to act in secret.