I tried explaining it but its impossible.This thread is nuts, Bangladesh faces no existential threat from India today, most people have not clue about the actual regional security arrangement here. There is no credible indicator to suggest Republic of India in short to medium term has any Strategic ambition to carry out a full scale/partial invasion of Bangladesh.
Regardless of this, whatever you think of Hindutva ideology and the threat they pose, this is a simple cost benefit analysis.
*India has two nuclear amred adversary on its Western and Nothern border with massive conventional armed forces who has claims on Indian controlled territory, and both adversaries never stoped actively persuing their claims.
*While BD is small country it is actually quite big population-wise. It has the demographic depth. And it's terrain is not armored and mchanzied friendly at all.
*Indian army has around 38x divisons. While it faces around 20 PAK army divisons on its Westeen border. it also faces PLA Western command on its entire North. it is a big stretch to think Indian army can spare roughly one third of its fighting power (13x divisons) for a 'special military operation' type adventure in BD against 10x Divisons size BD army.
*Last but not the least, today the offense/defence balance has shifted dramatically in favour of defence from what it was 50 years ago. People who are actually familiar with contemporary military literature knows what I am talking about.
India has pretty decent relationship with Bangladesh and its rulers and there is nothing to be gained by messing that up. Infact a friendly Bangladesh helps it to mitigate its geographical vulnerability. But then, there are those who believe that they will be able to establish some kind of Pakistan Bangladesh allied forces, against India. Oh well, wishes are free.