It's been stated repeatedly both in and out of the game itself that it is all a matter of perspective and isn't a case of 'good guys' and 'bad guys'. Furthermore victory for one side in a conflict generally results in heavy losses for the other, often through circumstances outside of their control.
More often than not, some people seem to simply expect certain characters and factions to just roll over and die out...which doesn't strike me as a reasonable resolution. It's admirable for anyone to do whatever it takes to protect their loved ones, though that goes both ways - not just when the Scions screech and drool about 'hope' and how much they want to go on an adventure and see a 'bEtTeR tOmOrRoW'.
Back in Shadowbringers, the Scions already admitted that if they were in Emet-Selch's position then they would do the same thing that he was doing. Which, again, is understandable - why wouldn't the Sundered do everything possible in order to survive and preserve their kind? However, again, it makes perfect sense for the Unsundered to have the same goal and desires.