Let me tell you, there is a difference between Islamization & Islamic extremism. I hope you understand the difference. Pakistan has been the "Islamic Republic of Pakistan" since 1956, when it was incorporated into Pakistan's constitution, & that is what is referred to as 'Islamization'. The purpose of 'Islamization' was to help bind the 5 basic ethnic groups that had nothing in common with each other (Punjabis, Sindhis, Pakhtuns, Balochis, Bengalis): the language, cultures, even the historical leaders (kings & rulers in the past) were different. Religion served as a unifying force, a binding force that helped Pakistan overcome separatist movements from Sindh (Sindudesh), Pakhtuns (Pakhtunistan), Balochis (various groups), Bengalis (Mukti Bahini, but this eventually failed in 1971 as the geographical challenges/huge distances over enemy territory were a huge problem that could not be curtailed). Islamization does not refer to Islamic extremism, but to use moderate Islam as a unifying force to hold the ethnicities together & overcome separatist movements & lingual/cultural 'deficiencies'.
Islamic extremism basically took place after the Soviet war, but listening to the international media, what you probably don't realize is that the core of the Pakistani society abstain from extremism (which is why an Islamist party has never been brought into power by the people), because the foundations of the nation & its people are strong, & will continue to be strong. Pakistan has seen far worse times in 1971 than it does today. At the time, Pakistan's defenses were weak, & there was a high chance after Bangladesh became independent that Pakistan would no longer remain. Today however, despite big challenges, there is more reason for optimism in Pakistan.