What are three instances in "The Birds" in which a character behaves ignorantly or endangers themselves or others?

There are a number of instances likes this in "The Birds." One example is when Mrs Trigg dismisses Nat's story about the attack on his home. In fact, she goes as far as to mock him:

“Sure they were real birds,” she said, smiling, “with proper feathers and all?"

Her disbelief and ignorance towards the birds' attack on Nat and his family is significant because it foreshadows her own demise later in the story.

Secondly, Mr Trigg demonstrates his ignorance when he fails to board up his windows and doors, despite the advice on the wireless and the warnings from Nat. He thinks that these warnings are nothing more than scaremongering and he believes that he can protect himself with just a gun—another example of his ignorance.

Finally, while not strictly a character in the story, the BBC endangers people by not maintaining its emergency broadcasts. For much of the story, Nat and his family wait desperately by the wireless for news of what to do next and for updates on the situation across the country. By not updating people on the current situation and not giving further advice on what to do, the BBC leaves families, such as the Hockens, to battle the birds alone.