Arsalan so innocent of you to drag BJP in this, except BJP didn't existed in 47 or even when Bangladesh was formed, they came in 80's.
Do you know who existed before even 1947? Jinnah, and do you know for how long he worked for dividing the country into Two? 40 years and when he still didn't get it he resorted to violence, Hindu-Muslim riots, you can search for Direct Action day. How his personal wish to be a King of one country led to death of thousands and then millions suffered and died after partition.
You can check his lifestyle, his house before partition if you are really interested in knowing him more, just bear in mind during all this time commoners across undivided India irrespective of religion couldn't afford eating two times a day.
If you want to know about hatred you can simply read your constitution and law you will get fairly good idea, if you still want to go deeper read from proper sources and then analyze it in context of that time, decisions that look Royal today were vulgar display of wealth and the decisions that look like cowardice were very sane in that period of time, all in all never forget context you will get clearer picture.