They know of the dangers of placing an entire future in the hands of politicians. Patriotism might be OK if governments were consistent and let you be free. Most of them think that all people who own businesses, securities, gold, foreign bank accounts or property are criminals who should be relieved of them and what little freedom they still have left. It is therefore imperative for the security of anyone of substance or ambition to have at least one other passport and nationality. Every country has its own citizenship rules.
Some countries welcome individuals with nationalized ancestors.
Others give passports to those of a certain religion. Some for simply buying real estate, or through so-called 'Economic Citizenship Investment Programs'. The rules and the opportunities are endless. Political instability in your country of origin makes travel on your current passport difficult. Your assets are the target of litigation or you are burdened by taxation.