So, you're saying that even people down in the engine room should be held responsible for the sinking of the Titanic? This amount of victim-blaming is laughable, if it weren't so sad.
I guess you've never worked in a big company, because there are limitations on the power and influence of an exec, no matter whether or not they're an effective leader. Their primary responsibility is to keep their own house in order and execute to their objectives. If an exec tries to overstep their bounds too often or by too much, they get shown the exit by their peers and superiors. I just saw this happen at my company, at the end of last year, when my boss' boss got fired for stirring up too much trouble elsewhere in the org.
There's a saying that comes to mind: "a fish rots from the head down". The corporate culture get established and reaffirmed at the top. Now, if the corporate culture highly prioritizes managers and employees taking a defensive posture and not speaking up about problems or taking initiative, at some point that begins to select for which employees stick around and get promoted. When people who embody that mentality become the workforce, or at least the management, it does get a little harder to say they're not at fault. Therefore, because a culture problem is at least partly a people problem, changing such a culture will necessarily involve breaking some eggs.
So, I'm not trying to let the execs, managers, or even rank-and-file employees off the hook. I'm just saying they're probably not the root of the problem and we just don't have enough information to know which of them really need to go. The one thing I'm certain about is that a lot of people are getting let go who were not bad apples, and it's just lying to make ourselves feel better to say otherwise.