This one time my mom sat my brother and I down and told us, "Okay, there is a four letter word that you should yell no matter what the situation," and had us guess. Some of the guesses included: "Rape" "Fuck" and "Shit." It was interesting.
Yeah, fire is a lot easier to take care of. You don't have to get in a fistfight with fire, you won't get raped by fire. If a person yells "Fire!" more people are likely to come because they feel that they can make a difference more easily, since all they'd have to do is try getting people out of immediate danger if possible then call 911. Then once they've come to the rescue, they'll seem like a huge asshole if they just walk away.
Fire is very dangerous, when fire meet any type of gas...... And it burns your face off. "Help help I'm being raped" is better, people will go to see where the help calls are from and call 911.
Our teacher taught us to yell fire because people tend to have a weird fascination with watching fire, and sometimes when kids are playing they'll scream "Help!" when playing tag or something, but its unlikely that they'd yell "Fire!" unless there really was one.
"Fuck, fuck, FUUUUUUUCK!"
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-You.