No not justifying, He is punished according to Israeli law. Islamic law or international law is not applicable on Israel.. I will remind you one few incidents...
1. Hafeez Saeed and ISI: Murdered 200+ indian, no punishment, not even symbolic.
2. 2000 Ramallah lynching , where a unarmed soldier was lynched by Terrorists, No punishment, not even symbolic.
3. Ahmed Omar Saeed Sheikhr : killed indian passenger , Not punished , not even symbolic...
You should be happy that Israel is punishing the culprits...