The terror organization seems to bend rules attacking Islamic countries like Turkey and Bangladesh, but the surprise gives rise to sanguinty when we understand that both these countries border a state that is of typical interest to the group.
Lebanon, as it is knows, is the transit point for new entrants into the terror group. Of late, the once porous borders of the country have been sealed under international pressure. Moreover, the country has also been forced to join hands with US military to conduct air strikes in Syria, resulting in destabilizing the group and freeing the Iraqi oil hubs.
Bangladesh, on the other hand, is already a den of terrorists targetting the Indian sub-continent that has joined the league of anti-ISIS missions (even if not directly). However, the seed of hatred has already been planted in the country with close to 25 youths reportedly joining the group and many more being brainwashed online. Indeed, India holds growing prospects for the group. But, there is a wall of the world's largest military forces in between that needs to be destabilised. The best way to do that is to create unrest in the weakest link at the border.
Attacks on Bangladesh
Murder of several foreign visitors, murder of a police constable, the bombing of an Ahmadi Muslim mosque (which is a branch of Islam (considered the polytheist Qadani sect by the ISIS), the attack on a Shiite mosque, the shooting of a Sufi Muslim shrine chief and an attempt to murder a Christian pastor are some of the several attacks on the country.
As A.N.M. Muniruzzaman of the Bangladesh Institute of Peace and Security Studies rightly points out, "these attacks as a full-spectrum assault on society, hitting sectarian, law enforcement, military, and foreigners."
The ground is already set for the ISIS here. Consider the activities of the Jamaat-e-Islami party, which is tied to Jamaat-ul-Mujahideen Bangladesh, which in turn is getting good notice in ISIS. People, especially foreigners have complained of a persistent fear that has confined them within homes, some even choosing to leave the country. Economy is played upon here, destabilising the country even more. Add to this the fact that the Shiite minority's fear of entering the mosque given the strategy of the IS to attack mosques.
Socio-Political scenario suitable for ISIS
The ISIS probably draws on the much-debated history of Bangladesh. The fact that the military here was more of a politcal entity ever since its inception rather than a part of the government's defence forces has not been out of the mind of the ISIS.
The fact that the Bangladesh Army thrived on the cohesive forces of the Islamic fundamentalist groups is evident from its presence in the rural areas and the urban areas where the soldiers and the officer ranks are drawn from. The main targets are university students, an indirect attack to education. It is to be noted that ever since independence of the country, the Islamic constitution has brought little relief to the masses and the trend has continued.
The snior heirarchy of the military here are psychologically inclined to the Pakistani forces, which is worrisome for India. Bangladesh also believes that the only way to keep India's might at bay was to use the weapon of Islamic fundamentalism, now that the political fixation of both China and Pakistan have changed.
In other words, the political situation here has left Bangladesh susceptible to such havoc.
All ISIS is doing is adding a little oil to the fire and divert the attention of the world to the internal problems rather than at the India-Bangladesh border, hence making it porous.