East Pakistan had population of majority whose mother was
Bangla which is close to
Sanskrit Western Pakistan was forcing
Urdu on to
Bengali people in East Pakistan which would mean demeaning there own language and culture, which was not acceptable by many in East Pakistan.
Hindi is not National language of India there is no definition of National language in Indian Constitution. Article 343 states
Hindi as official of Union.
India dint conspire
Language Movement, it was
Bangladeshi People who felt alienated by announcement of
Urdu as National language. This is what Jinnah said in 1948 when he visited
"State language of Pakistan is going to be Urdu and no other language. Any one who tries to mislead you is really an enemy of Pakistan."
Later on differences grew between protesting Students of Dhaka University and West Pakistan and the later failed in persuading people in East, hence the
Language Movement of Bangladesh
Sources : Official BangladeshBangladesh History