What about Israel butchery nowadays?
The missiles fired at Israel gives Israel right of self-defense.
The missiles are clearly a war-crime when fired at cities.
Any response must be "proportional" to military gains.
As far as I know, there is no definition what "proportional" means.
Looking at the sum of the casualties is wrong. You have to look at each and every incident.
If a missile is located in a building, and there is 1 civilian there,
I guess it is likely to be OK to bomb without this being considered a war crime.
(remember that presence of civilians does not protect a military target, according to Geneva convention)
If destroying a large building with 5000 civilians dead, then most likely it is not proportional.
If you ask for the limit, (66 killed OK/67 killed not OK) noone knows.
Facts does not matter as much as perceived facts. if Israel has proof (which later turns out to be false)
then it is a mistake, and not a war crime.
Civilians have very little protection under the Geneva convention.
You cannot determine if any specific death of a civilian is acceptable
collateral damage (military significance of target high), a mistake or a war crime
before a thorough investigation has been made by a non biased organisation.
I will not criticize nor condone any such operation, until such investigation has taken place.
What I do believe is that no good will come from either missiles or bombing, and both have to stop.