Then I'm not sure why you put it in reply to a comment that just talked about how they don't understand how people could do that, if it's not relevant to the threats.

Because the OP was about angry customers, not exclusively about death threats. Of course people are angry, because they in many cases actually lost something. In many companies, you book leave months out and cannot change it.

They were still promising there would be no more delays with less than a month to go, even saying only a natural disaster would stop them. Now we know that's a lie, and they were deliberately misleading customers.