In actual fact we Bengalis in both West Bengal and Bangladesh do share similar cultures, just not religion, our culture is the uniting force whilst out religion is the dividing force, so stop say bull**** that you don't understand, that's why Bengalis are empathetic for one and another, once again for example, when the shabagh protests happen (A protest against the Razakars) Bengalis in West Bengal wanted to do protest as well in Kolkata, however Mamatama did not allow this, because she did not want to hurt her extremist supporters. True story. From this we understand Bengalis like each other, but religion is the ultimate dividing factor, and it's generally the Extrimist elements who are making it the dividing factor. Extremist hindus and Extremist Muslims, that is why we Bengalis despise almost everything mamatama has to say and what Hasina has to say, we know these numnuts are working covertly for their supporters.
Bengalis unite- we share love, in respect of someones religion, creed or culture. We are one of the more progressive leaning ethnic groups in India (and Bangladesh).