Let's put your analogy into the current outbreak of fighting:
Three Brits are killed in Ireland. Britain immediately sends in the military and arrests hundreds of Irish politicians and civil servants, killing several Irish civilians at the same time, claiming it was the Irish government that killed them. An Irishman is plucked off the streets of London and killed in a revenge attack.
Irish resolve breaks and they retaliate, firing the only long range weapons they have, unguided missiles, at the UK. The UK government then start firing guided missiles at buildings and homes, killing hundreds before sending in the troops, claiming they are only defending themselves. While the troops are being sent in it becomes apparent the UK knew the Irish government had nothing to do with the killing of the three Brits from the start.
Ceasefires are called and Ireland stop firing rockets, yet the British military keep blowing up Irish defensive installations. In response the Irish start firing rockets at Britain again.
Now obviously it's the Irish's fault in the above story right?
No one here is saying Hamas aren't throwing the occasional stone into the pond, however they aren't throwing rocks at the ducks like the Israelis...