Sometimes, when trains arrived at the Auschwitz concentration camp, some of the Jews would be armed and would start shooting at the guards, using the other Jews as human shields.
After such terrorism, of course the guards had to kill all the 6,000 or so people on the train. What else could they do? The Jews should not have opened fire but passively accepted their fate.
The terrorists in Gaza have killed three Israelis with their rockets. So, of course, the Israeli government must kill several thousand Palestinians. What else can they do? They have to seek a final solution to the Palestinian problem.