@indushek,
This earlier post of mine, where I outlined my conjecture about the Aryan invasion, answers your questions.
http://www.defence.pk/forums/centra...story-indian-subcontinent-37.html#post3589593
Just to address the specific points in your post again:
The Aryan invaders had a tiny footprint; once they took over a particular tribe/clan/kingdom and entrenched themselves as the priesthood, they became "invisible" since the rulers, soldiers and masses were all locals. The Aryans piggybacked their cultural conquest on the back of the internecine wars where both sides were locals, so there was no reason for anyone to record the wars as a foreign invasion.
As for Islamic massacres, what's worse? To kill a few thousand men, women and children, or to completely eradicate the cultural heritage of the conquered peoples? To conquer not just their bodies, but their minds and their children's minds and their children's to the point where all that remains, after millenia, is a faint, ancestral memory of a conquest? As Joe and others have pointed out, this Vedic cultural conquest is still underway in parts of India. The few remaining stalwarts -- scions of the IVC? --are the only link to the original culture of the subcontinent before the Aryan cultural invasion.
The Aryan priesthood was no more inclusive than the Mughal court The Aryans instituted a rigid caste system to keep the priesthood exclusive (initially) and to keep their racial line pure.
As for Mughals' contribution, it depends how you look at it. We consider Islam to be a contribution, just like the Aryans contributed Vedic culture. Materially, the Mughals led India to become an economic powerhouse and have 25% of the world's GDP. There were other cultural contributions which I will leave to historians, but your comment highlights the extent of revisionism going on within India to whitewash the positive aspects that accompanied Islam into India.
Finally, blaming Pakistan for Indians' hatred of Muslims is rich. That's putting the cart before the horse. While I agree that the political conflict with Pakistan gives oxygen to religious bigots on both sides, it would be wrong to dismiss it so easily. The Hindutva movement to restore India to its "natural" culture and "purge" it of foreign contamination is purely an internal matter, with internal dynamics. Blaming it all on Pakistan (or Bangladesh) may assuage some people's guilt, but it won't solve the problem of rising Hindu fundamentalism within India.