Unlike Elton John, sorry seems to be easiest word for Israel.
This time, they are apologizing for bombing the UNRWA headquarters in Gaza- a building that housed about 700 Palestinians from...the current bombings.
The string of events happens like this for Israel:
1-Bomb shelter/people/UN headquarters
2-Israel: "We're sorry" or "Terrorist group X was using these people as human shields."
3- The world: "alright, we forgive you. Just don't repeat it again."
4- Israel: "Alright, moving on. Next target."