Your govt. is afraid of what you already mentioned, North East states and BNP's perceived support of these rebel groups. In reality it is not a job for BNP or for anyone in Bangladesh to police for them, but Hasina does it for free, as if we are part of India. Also, the water policy and having a market for Indian goods etc., the list goes on and on, we cannot make our rightful demands and make our voices heard to international body and world stage, Awami League keeps everything under lid to protect Indian interest.
Bangladesh is a country with a GDP of about $154 billion. So India and Awami League both partner in looting Bangladesh economy, a large part of the looted capital ends up in India, since Hindu's under Awami League (Suranjit is a good example) who make a killing usually move to India, when money making is all done and over with.
All this party comes to a screeching halt, when BNP comes to power.
Regardless of what excuses you may have, NE insurgent support or any other, that is something you can take up with the govt. that may be responsible for that, but if you put your hand in Bangladesh and meddle and interfere, your hand will get burned and you will never know how bad the situation can get, once you start playing with fire, which you have been doing for decades. Bangladeshi public is finally becoming aware, as it has become a matter of public attention, not just some PDF members here. People are finally putting 2+2 together and coming to their own conclusion. So your clandestine days of playing games of meddling and interference is pretty much over. Since the problem has been finally identified, now its only a matter of time to dismantle the network of Indian agents in Bangladesh.
Eternal vigilance is the price of freedom.