Accidentally killing someone in service of destroying a military is not as bad as a regime just deliberately killing its citizens, no.

But at some point incompetence crossing the line to being gross and shifts the moral balance as well. This wasn't a 'deep in the fog of war' situation, that girls school was part of an opening strike package...and because of that, we need to find out more, but that "deliberately" is an open question with the facts we have now.

How does one "accidentally" target a school three times?