Premeditation is arguable. We knew innocent people would die. However, we didn't know when, where, why, who, or how they would die, which makes it hard to believe anything was premeditated.
You are better off arguing manslaughter, because there is no murder of innocent civilians. Then again, manslaughter only exists when a law is in place, and there are no world laws, which is why collateral damage is not punishable.
Trying to justify civilian death, in order to prevent civilian death is something I am not going to try and argue, because it is so hard to understand why it happens. The only way you can is to guess into the future, and ask yourself: