Bitter Spring is not the norm. One example does not change everything else. "Fog of War" Bad things happen. Every War is going to see people killed by mistake.
NCR is under alot of pressure in the Mojave. After Bitter Spring the Papa Khan was not open to talking with NCR but others were. NCR has the Legion at their door, powder gangers running loose. They are one edge. Things go wrong when on the edge.
Bitter Springs happened before Legion and The Powder Gangers.
They're wasn't a 'Fog of War'; the 1st Recon and their Commanders knew what was going on and they still continued to fire.
So the women and children were enslaved because they were scum? Some how children had it coming?
The Women and Children where enslaved because they woulnd't get any help from the NCR, they'd get shipped off to some Refugee Camp to starve to death.
I'd say that The Legion did those kids a favor.