Dogs can’t defend themselves against fireworks, all they can do is run or hide, so they get way more sympathy. A human has more options to prepare, at least usually they do. At least that’s my guess.
That's at least part of the rationalizing, yeah. A vet knows what July 4 is, what fireworks are, and can read a calendar to know when they're going to happen.
Of course, assholes setting them off for weeks before and after the firework holidays are equally unpredictable to everyone, human or dog.