I was looking at a small part of the sequence of events. I may be wrong but I do not think it has been shown that the government of Gaza or the people in general of Gaza were involved in the killing of Israeli soldiers or the kidnapping of an Isreli soldier. I understand it to have been rather a military wing of Hamas (as distinct from the government as the IRA or "Real IRA" are from Sinn Fein or the government of the Republic of Ireland) that did the deed.

If I am right in that then the destruction by Israel of the Gaza civil infrastructure and the seizure by Israel of members of the Hamas government are without justification and are acts of international aggression and acts of war.