Only searching for disasters on the web aside, on most researches on Disaster behaviours, people who "misbehaved" were only a few percentage.... Though they usually also get MOST of the coverages cause, well, its more interesting to readers. https://www.theguardian.com/education/2010/mar/16/disaster-planning-researchhttp://boingboing.net/2011/03/22/how-people-really-be.htmlhttp://www.cpbr.gov.au/disact/human-response.htmlhttps://en.wikipedia.org/wiki/Sociology_of_disaster#Behaviour_before.2C_during.2C_and_after_disasters
(PDF of a textbook, from an actual emergency management organization)http://www.crhnet.ca/anticipating-human-behavior-disaster-myths-exaggerations-and-realities
We're evoloved from herd animals. There would always be exceptions, but mostly the biological responses written in our genes mean that, "everybody else are in their own ways, 'generally' as least as good as YOU can be.
Or, just checked every single non-manmade huge disasters (ie. Not Wars nor prosecutions.) that's happened for the past hundred years. So which of them happened like those horror movies?
But put it in the Hollywood Prespective:
An end of the world scenario, with no explosions, everybody go back home to stay with their families, old wounds are mended, old hatred forgotten......
This or Transformers 5, which one do you think will sell much better?
(Oh right, that's also a frequent theme of those saved-by-gods films BTW.
It's also the same reason why Zombie Action/Horror Movies either turn to Super-Monsters or fall back to the "humans are the worst" or both... Hundreds of slow, rotting mindless drones that one 10 year old boyscout with a picnic knife can deal with in a long afternoon is NOT EXCITING AT ALL.
If the movie is not exciting, nobody will watch it, just like if you run a game that has nothing to do, very very few people would want to play in it.
Or, the difference between "Contagion (135.5 million)
" vs "Resident Evil The Final Chapter (312.2 mill)
Its a myth based on commercial necessity, really.
There's still one thing though:
People behave according to the information they are given... So if enough people think that what happen in disaster movies are "real", there are actually a higher percentage of chances for them to behave accordingly during disasters...
That is ABSOLUTELY NOT a good thing at all.
(About as good as trying to level up in real life by picking up knives and use them to kill rats for real...