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Its been a first time that I have commented over such a issue. I have blamed both sunnis for siding with saudia and shias for siding with iran. So its been the fact that I am one of the most tolerant person when it comes to sects. The theory of saadat is just a made up history to malign bin qasim. You will only find people like tariq bin fateh to support this theory. All the main stream authors have not considered it a valid theory and the conquest of sindh had motives to get rid of piracy and the extension of empire. You cant say that it was a war to save islam but just like other conquests of iran iraq and central asia. But just because of you sectarian alignment you are misrepresenting the issue.
And No raja dahir wasnt a hero he was an oppressor. He persecuted local buddhists who sided with bin qasim
en.wikipedia.org