All after Hamas made the decision to attack Israel. Thus all that is the fault of Hamas.
Hamas doesnt follow international law or the geneva conventions. In fact it is listed internationally as a terrorist organization.
Hamas and Palestinian Islamic Jihad: Council establishes dedicated sanctions framework and lists six individuals
The Council today established a dedicated framework of restrictive measures that will allow the European Union to hold accountable any individual or entity who supports, facilitates or enables violent actions by Hamas and the Palestinian Islamic Jihad (PIJ).
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University of California, Berkeley
https://lawcat.berkeley.edu › files › fulltext
"The conclusion that unlawful combatants, including terrorist organizations and organizations that harbor them, are not subject to Geneva Convention protection also has other important consequences besides national security and the collection of life-saving military intelligence."
Thus no nation has any obligation to follow the Geneva conventions when dealing with terrorists.
So no- Israel did not violate the Geneva conventions, etc.