Welcome to capitalism
If the execs want to be considered as personally responsible when things go well (so they get very very big personal rewards), then surely they must also be considered personally responsible when things go wrong, hopefully up to and including being personally locked up where appropriate?
One of the primary attributes of a corporation (arguably the most important one, though it's in a dead heat with concentrating capital) is that it limits personal liability. Capitalist societies accept granting this benefit to the owners and management of corporations, in exchange for the increased economic efficiencies and productivity that in theory follow from increasing the economic incentives for entrepreneurial activity.
Of course "limited personal liability" is itself limited, and management should be held accountable for misfeasance and criminal activity they had knowledge of. And even beyond that, the law (I think rightly) can hold them criminally negligent even when they don't have knowledge of some categories of corporate misbehavior.
But to say that they should be "personally responsible", full stop, is to junk the corporation and other limited-liability structures in favor of personal direct ownership and partnerships with no liability protections. It'd basically be a return to feudalism and coverture.
 By "accept", of course I mean that the gradient of political power, which is what undergirds the legal superstructure of a society, maintains it. That's the result of complex fields of vested interests and ideologies; it's not like everyone in a society sits down and says, "here's the list of trade-offs we're going to make".
 And in practice, historically; there's never been an economic system of size and efficiency to rival global capitalism. That doesn't make capitalism the "best" system in some essential sense, but it does mean that no one's been able to demonstrate a viable superior alternative in real-world conditions.