Let me provide you with a short form history:
Palestine was an independent region.
After WWII, to provide a protected enclave for Jewish people, the Allies took part of that territory and gave it to the Jewish people.
The expected clashes arose, and the Jews and Palestinians in the region disputed what areas should belong to each group. Compromises were made, neither group was happy.
The nation of Israel was formed, as was the Palestinian territory. Israel refused to recognize Palestine as a political entity.
Then began a 70+ year push by Israel (not all Jewish people) to claw back and settle other bits of the Davidic Israel for the modern Israeli nation, taking this land from the Palestinians who lived there.
In one particular area, Israel controlled all access to Palestinian land, and set up Hamas to govern it in reaction to a terrorist organization that had been operating in the area. Palestinians elected Hamas to govern as they provided stability and protection from both Israel and the terrorists.
Then no more elections were held for over 20 years and Hamas turned into the exact organization they were set up to oppose.
Eventually, with the backing of Iran, Hamas moved to an all-out war on Israel, hiding within Palestinian citizenry.
Israel responded by actively destroying any location known to be linked to Hamas activity, regardless of the impact on innocent bystanders with nowhere to go.
So it doesn’t matter if you lay the blame for first move at Hamas’ feet… we’re talking about Israel destroying Palestinian infrastructure here.
Hamas has the entire Gaza Strip held hostage, and Israel is responding by killing those hostages and destroying their infrastructure, to root out Hamas insurgents that are hiding among them.