The killing of Jaabari was done in response to around 120 missiles thrown at Israel prior to the killing. There might have been peace talks but it seems like they had stock of missiles they wanted to ship out before any peace was signed for. The bottom line is that both sides of this conflict are held hostage to a very vocal and armed minorities of both sides who would like to keep the conflict burning on. Its no wonder that these things happen just before elections. Both sides have an interest to keep a right wing government in place and the best way to do this is by firing missiles and retaliating against them. Fear drives people to elect a right wing government and nothing drives fear like a bunch of missiles and a heavy "disproportionate" response.
Until both sides wake up and realize they are controlled by tiny minorities with guns there is no hope to resolve this conflict.
