The prime minister has repeated his war aims many times – destroying Hamas as a military and political force and bringing the hostages home.
Neither has been achieved, despite a year of war that has killed at least 42,000 Palestinians and left much of Gaza in ruins.
But the remaining hostages are not free and Hamas is fighting and sometimes killing Israeli troops.
Killing Sinwar was the victory Israel wanted. But until Netanyahu can claim that the other war aims have been accomplished, the war, as he says, will go on.
Yahya Sinwar was born in 1962 in a refugee camp in Khan Younis in the Gaza Strip. He was five years old when it was captured by Israel from Egypt in the 1967 Middle East war.
His family were among more than 700,000 Palestinians who fled or were expelled from their homes by Israeli forces in the 1948 war in which Israel won its independence.
His family came from the town now known as Ashkelon, which is close to the northern border of the Gaza Strip.
In his 20s, he was convicted by Israel of killing four Palestinian informers. During 22 years in jail he learnt Hebrew, studied his enemy and believed that he worked out how to fight them. His time in jail also meant Israel had his dental records and a sample of his DNA, which meant that they could identify his body.
Sinwar was released as one of more than 1,000 Palestinian prisoners who were swapped in 2011 for a single Israel soldier, Gilad Shalit.
On 7 October last year, in a meticulously planned series of attacks, Sinwar and his men inflicted Israel’s worst-ever defeat – and a collective trauma that is still deeply felt.
The killing of around 1,200 Israelis, the hostage-taking and the celebrations of their enemies recalled for many Israelis the Nazi holocaust.
Sinwar’s own experience in a prisoner swap must have convinced him of the value and power of taking hostages.
In Tel Aviv families of the remaining 101 hostages in Gaza – Israel says half of them might already be dead – gathered in the square in which they have been gathering for a year, urging the Israeli government to launch a new negotiation to get their people home.
Einav Zangauker, mother of hostage Matan Zangauker appealed to the prime minister.
“Netanyahu, don’t bury the hostages. Go out now to the mediators and to the public and lay out a new Israeli initiative.”
“For my Matan and the rest of the hostages in the tunnels, time has run out. You have the victory pictures. Now bring a deal!”
“If Netanyahu doesn’t use this moment and doesn’t get up now to lay out a new Israeli initiative – even at the expense of ending the war – it means he has decided to abandon the hostages in an effort to prolong the war and fortify his rulership.
“We will not give up until everyone returns.”