Why do humans let off these terrible fireworks without warning?

Dear George,
Throughout my four years of life, I have always been a cat noted as much for my steely feline nerves as well as my luxurious coat and whiskers. Lately, however, my nerves have been severely shaken by the relentless human tendency toward the prosecution of ridiculous, noisy, unpleasant "customs." I speak of the American habit of setting light to these foul-smelling and explosive "firecracker" contraptions all night long beginning on what is apparently some sort of human date of note, earlier this month, and continuing throughout the warm summer months. The noise is deafening, and the smell worse. My human has served me effectively during such things as violent thunderstorms, and I have trained her to provide me with brushing and a steady stream of tuna-flavored Pounce during such natural calamities; however, fireworks "displays" are a thousand times worse.
I hope that you will not judge me too harshly when I confess, feline to feline, that I apparently have some sort of weakness in the face of such events. Quite honestly, I have been logging a lot of time under the bed, in closets, and up draperies, and frankly, shaking. I can't stand the noise! My nerves are just about shot. My human, good soul, wishes to help. Aside from laying in a larger-than-usual supply of Pounce, how should I instruct her to serve me during these firework catastrophes in a manner which will make the situation more agreeable to me? (Incidentally, in her blockheaded human fashion, she does not appear to be unnerved by the explosions, per se, but rather by my reaction. I fear that causing her distress in this way will cause her performance in my service to suffer. It's hard enough to get good help these days, and I wish to retain her in my employment as long as possible.)
Anxiously, Puss-Puss.
P.S. Here I am in my favorite window. As you can see, I am quite calm, and serenely watching the juicy little birds hop about on the lawn.

Dear Puss-Puss,
You are right to be frightened. Humans are probably the most inconsiderate and destructive species in the world. They rarely consider our comfort - unless we train them to do so. But your human, trained by you, did not set off these fireworks. It must have been neighbouring humans who don't have cats and don't think of feline welfare. Or canine welfare, come to that. Some dogs are utterly terrified by these explosive noises
That said, your human obviously failed to foresee this significant date which is (I can reveal) July 4. Other dates are Fireworks Day in the UK, November 5 and New Year's Eve, December 31. Why these particular dates I have no idea. It's just part of the time-obsessed human way of life - special days in the year, strange intermittent two-day periods called 'weekends', so called 'holidays' when they desert us for several days. Clocks that tick, clocks that don't, computers that show time mouse tracks, alarm bells, cries of "You'll be late". They don't know how to settle to a sensible day-night routine based on light, a routine used by every other species that lives above ground. They live in fear of the future. They can't live just in the day like the rest of us do whether we are cats, birds or lilies of the field.
But I digress. If your human know in advance that fireworks are going off, the week before she could install a Feliway diffuser, which exudes a calming feline scent, or get a Feliway spray and spray your preferred room with it about ten minutes before the fireworks start. But if she doesn't know they are coming, its more difficult.
Most importantly, she must shut the cat flap so that you can't run out in fear and get lost. During Halloween or Fireworks day, there's the possiblity of feral humans catching you and throwing you in bonfires or hurling fireworks at you. She must keep you indoors from twilight onwards and give you somewhere to hide.
Keep your courage up. It's only a few days a year.
George.
PS. Keep away from cat lovers in the US who catch up black cats and hand them into animal shelters before Halloween. They have the best of motives but seven out of ten cats so handed in are euthanased. Only no-kill shelters can offer real safety.