I really thank you for bringing this up, did Hamas attacked Israel, no, how many Israelis were killed before the attack, none. The three Israelis were they anywhere near Gaza or has any clue been found that Hamas was linked? Also Israel helped in the creation of Hamas, just google it. Solution is possible but Israel is one that doesn't wants it, not Hamas.
Do we all need to solve this on-going killing..absolutely yes!
No point in talking about the past..the present and future is where the energy should be expended...and again I will say the future does not / should not include Hamas ... Israel should exist and Palestine should do as well...No killings boss enough of this this is in-humane.