There are plenty of times what you trust is the interests of the brand holder to defend the value of the brand where regulation can't help you. Coke in a sealed bottle is extremely likely to be coke in a sealed bottle in Mogadishu. The brand "Coke" gives you some information about the probability of not drinking poison. Obviously it isn't perfect. I think it's evident that it isn't something to be dismissed as inconsequential information either. Coke will be trying very hard to make sure nobody impersonates them and kills their customers anywhere in the world because it would be an advertising disaster. Better that than nothing.
(Just quietly I hate the coca cola company and think they are pretty evil. Diabetes. Obesity. They're similar to a cigarette company. Meh. Useful points can still be made using their business as an example.)
> Coke are going to enforce quality control and safety to protect their brand or get out of that market. There is no regulation you can rely on in this mythical country - but there are quite a few countries like that which you may know yourself from having visited them.
I'd argue that in a lawless country people have no faith in the brands either. Look at the fake Apple stores in China, or at parents importing identically-branded baby formula from abroad because they (justifiably) didn't trust the locally produced version.