Facebook cannot and should not be the one attempting to reconcile cultural norms across the entire world into a single speech code that satisfies everyone.
In my opinion the problem with social networks is just the effect of an underlying cause, which is that many people are so poor, uneducated, sick or old that they only care about the immediate future. Religious and inflexible people will believe anything that reaffirms their beliefs. They will bite at all fake news and spread it around and vote in a disastrous way for the future of the country.
Unfortunately there will always be a part of the population that lacks long term concern. You can't improve social networks when people are lacking long term concern, which is usually the domain of young educated professionals, who have the most to lose from this folly.
The people who don't want Facebook to impose its community standards outside the US usually just want to be able to impose their own community standards on others. They're no better than Facebook. Why should anyone care what they want?