Okay, punish the two who actually did it, the relatives who helped cover it up, but especially the society that views such killers as heroes.
In fact, it doesn't matter much whether or not you catch the actual killers at all as long as you rain pain down on that accursed "society." For every Jew who is killed, a thousand Palestinians should die. For ever Jewish child, ten thousand.
Rain pain. Rain pain and don't look back. It's come to that.
From 9/29/00 to 2/28/11 the IDF killed 6,407 Palestinians. Palestinians had killed 1,085 Israelis (30% were IDF).
While not in the proportions you advocate, 85% of deaths have been by the IDF. That's slightly more than 6 Palestinians dying by IDF hands for every Israeli killed by Palestinians.
That may be fine to you but it's clearly a failed "peace" policy.