1. I do agree that presidential system was not responsible for debacle of East Pakistan. It entails other issues. However, it was during that system that it occured (keeping aside democracy & dictatorship debate).



2. Parliamentary is suited to the countries which are socially diverse such as Pakistan. For instance president from one province, while prime minister form other, etc. Moreover, close cooperation between legislature and executive also gives a sense of ownership to the legislators. Last but not least, presidential system is development countries may adopt the characteristics of virtual dictatorship.