The deaths were a tragedy, and I'm still waiting for the alternative. Continued British rule? I am not attached to discussing this if you want to stop, just realize it wasn't obviously avoidable.
Had Britain not
deliberately pursued a policy of fostering conflict between Hindus and Muslims for decades, it is highly probable that the violence of Partition would never have reached such levels. It is in fact possible that the Brits might have been able to avoid poisoning their status with the Indian populace so as to buy more time for a peaceful negotiation to Indian independence, possibly encompassing a unified Hindu and Muslim state instead of a partitioned independence. Of course, that would have required decades' worth of Britain not behaving like oppressive, apartheidist tyrants.
By 1947? Not moving the withdrawal timetable up several months in advance of when independence movement leaders expected would also have been a better idea.
Not imposing borders upon the new states (and giving their British border-drawer 40 days to figure out the borders) would also have been better.
The point in my bringing up Partition, though, is that the forced relocation of great masses of people
is an inherently violent process. Partition is merely the most dramatic example, but there are many others. There's no such thing as forcing millions of people to leave their homes without mass death; had the Federation forced the millions of Federation colonists in the DMZ to relocate, it would
not have been some happy, peaceful thing as its apologists keep arguing.
Can't blame the Federation for that.
You can absolutely blame the Federation for attempting a forced relocation. In the case of Dorvan V, they were literally perpetuating a cycle of racist, colonialist oppression against Native Americans by attempting to forcibly relocate them.
When the alternative is (a woefully lopsided) war...
Is that the only alternative? Because given the situation that existed between 2366 and 2369, almost three years had passed without a war before the Federation started selling out its own people, and it's not at all clear that the Cardassian Union -- which had, of course, just been forced to withdraw from Bajor and lost out on gaining control of the Bajoran Wormhole -- was in any position to launch a resumption of the earlier war that ended in 2366.