I hear you. Our independence war as you say is an example of that and there are others. But, there has to be a genuine and well grounded reasons for unity. I can easily see a scenario where warring factions unite for a common purpose, but such alliances are only short term. And they end up going back to their historical differences.
As a muslim - I grow more and more pessimistic of the future. It's almost like we had our renaissance too early. Muslim rule reached a peak and there was a time when what Islam ruled was more or less was enlightened and tolerant (relatively speaking). But, there is no room for debate in the Islamic world today and even the young generation is growing moire and more intolerant of those asking for introspection.
For Islam to come out of this dark age, the focus has to move away from the ME - Muslims elsewhere outnumber them, yet due to historical dominance - they are still the authority when it comes to religion. Yet, the ME ( I speak of the rulers and regimes here, not the general populace) is not only a backward cesspool in terms of western democracy, but the same when it comes to Islamic rule and jurisprudence.
Now they removed the video after realising what they exposed.