Why does the phrase "Luis no se preocupa POR los demás" use por instead of para? Would it not be para because it is his opinion??

The focus here is not the opinion of the speaker but rather on the reason or motive of the action -- in this case, 'por' means 'about'  in the sense of 'for the sake of' or 'with regard to' ...

Explanation:

the ecuadorians are more hard working people and word from early sun raise until sunset. then you join with family for dinner and talk about their day. while in america it’s different. everyone live and have different rules and traditions habits.