You can't prove "who shot first" because the answer depends entirely on where history starts. People who want to argue about unanswerable questions like these don't want peace. They just seek justifications for further bloodshed. The actual moral questions are not difficult if you believe a Palestinian life is worth as much as any other life.

Israel has “new historians”, legit society polarisation due to its conduct and handling of the conflict, and over 500.000 demonstrations against Netanyahu’s demonic government.

What do Palestinians have that shows their will to believe an Israeli life is worth as much as any other life? (and Palestinian lives also, especially their children’s)