They assumed a far greater risk or probability that a series of terrible, unfortunate events regarding fan safety, the overall safeties of individual team players, stadium employees, event staff, coaches and their families/relatives getting caught in flooding, mudslides, poor visibility that invariably couldve led to severe injuries, car wrecks, collisions, etc. These events mightve been easily avoided if the NFL and L.A. city and county officials had exercised some proactive, necessary commonsense and postponed or cancelled a mostly meaningless pre-season game but the NFL FO, as is its want, reaffirmed all its gives two sheets about is unbridled greed, insatiable lust for money, ratings, and revenue for marketing/promotions. If some people happen to get injured or killed driving or being about in somewhat-dangerous weather conditions like tornadoes, potentially deadly severe thunderstorms, TS or hurricane-force high winds of, mudslides well fork them, they knew the risks of going out in terrible, inclement weather like that anyway, even if we pretended or made it seem like it was no big deal when it happened. The city of Los Angeles apparently thought or believed it wasnt too troubling, dangerous of a public sporting event to call it off themselves so we're covered there, too as a possible scapegoat, I mean legal cover or alibi...
Either way, our figurative and literal legal arses are covered anyway.
We dodged a bullet this time, it seems. We'll dodge another one next time when a bigger, larger, potentially more disastrous natural disaster is barreling down towards a major U.S. city like Miami, Tampa, or Jacksonville and we tell local fans not to worry there either.