Who is them though? The airport that used this software? You can't put all the blame on the software vendor. It can be a good and useful component when not relied on exclusively for the functioning of the airport. Not relying on a single point of failure should be the responsibility of the business customer who knows the business context and requirements.
You will have each company person pointing at the others. That's why you have contracts in place.
You won't ever have real consequences for executives and real decision makers and stakeholders because the same kind of people make the laws. They are friends, revolving door etc.
There's no responsibility at any level, is the thing. Those people who couldn't fly might get a rebooking and some vouchers sent out to them, but they won't really get made whole. The airport knows they won't really be on the hook, so they don't demand real responsibility from their vendors, and so on.
In the grand scheme of things, being able to fly around the globe at these prices is a pretty good deal, even with these rare events taken into account. It's not like the planes fell out of the sky. If you must must definitely be somewhere at a time, plan to arrive one or two days earlier.
You will have each company person pointing at the others. That's why you have contracts in place.
You won't ever have real consequences for executives and real decision makers and stakeholders because the same kind of people make the laws. They are friends, revolving door etc.