The Syrian government is announcing the deaths of civillians, and I don't doubt that Civillians were indeed killed. But I don't believe that the primary mission was to kill civillians.
This was a strategic assault against Pro Assad forces.
Don't get me wrong, I'm not condoning the attack. Just the opposite. I don't want war in Syria. But this is U.S. coalition fighters going directly against Assad's forces instead of continuing to allow ISIS surrogates to do it for them.
This is what the U.S. government has wanted to do for several years.