Islamic Organizations and Bangladesh

The current politics of Bangladesh is complex to say the least. But I am hopeful for the future. The People of this subreddit is pretty much against the idea of the establishment of Islamic state in Bangladesh. I really don't have much knowledge about political groups of Bangladesh. But what I do know is the current so called Islamic Organizations like Jammat-e-Islam,Hefazat-e-Islam etc don't seem Islamic to me at all. They seem more like power hungry maniacs using religion to gain their goals. I really want to be informed about the idea of Islamic state's establishment and why are so many people against it? Surely the current Islamic Organizations are corrupted but what do you think about the real Islamic state?