Stupidity: When the birds gather in the schoolyard, Melanie runs in to warn Annie. Rather than calling the police or fire department for help and then shelter in place until aid arrives (which would take about ten minutes), they instead decide to make a run for it with the children, out in the open, getting attacked by the birds. As it's the 1960s, the schoolhouse presumably has a working phone.

The Birds (1963)
1 stupidity
Directed by: Alfred Hitchcock
Starring: Jessica Tandy, Rod Taylor, Suzanne Pleshette, Tippi Hedren
Continuity mistake: As everyone runs out of the restaurant, the bushes on the left of the building that were there before are gone. (01:26:10)
Mitch Brenner: Aren't those lovebirds?
Melanie Daniels: No, those are, uh, red birds.
Mitch Brenner: Oh, I thought they were strawberry finches.
Melanie Daniels: Oh, yes. We call them that, too.
Trivia: There is no then-usual "THE END" title card as Alfred Hitchcock wanted to imply that the terror would continue without end.
Question: What's making the birds go insane and attack people?
Answer: None of the characters knew why the birds attacked, or the reason it was confined to the one town of Bodega Bay. The incident was so isolated that the outside news media was barely aware it was occurring or knew its severity, so there was no investigation into it at the time. Alfred Hitchc0ck's explanation was that the birds were rising up against humans to punish them for taking nature for granted.
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Answer: It is never explained, probably because it would ruin the mystery of the film to spell it out.