Who attacked who first? Gaza did right after the "No Fire" agreement ended in mid-December.

There is a concept which few Israelis seem to have heard of which is commonly referred to as "reasonable force". To summarise, it implies that launching a major ground offensive which kills thousands of civilians is a disproportionate response to a few stray rockets fired from Soviet-era RPGs.

Israel is just trying to survive. Palestinians parade the streets singing "Death to Israel"

Oh, the poor little Israelis having to deal with singing. That certainly justifies shelling civilian compounds with chemical weapons illegal under the Geneva Conventions. Chemical weapons which are designed to burn a person to death from the inside out.

https://www.theguardian.com/world/2009/mar/25/israel-white-phosphorus-gaza

First of all I would like to point out that Palestinians cannot have a claim to any land since they are not actually an ethnic people group.

The Palestinian people (Arabic: الشعب الفلسطيني‎, ash-sha‘b al-Filasṭīnī), also referred to as Palestinians (Arabic: الفلسطينيون‎, al-Filasṭīniyyūn; Hebrew: פָלַסְטִינִים) or Palestinian Arabs (Arabic: الفلسطينيين العرب‎, al-Filasṭīniyyīn al-ʿarab), are an ethnonational group[31][32][33][34][35][36][37] comprising the modern descendants of the peoples who have lived in Palestine continuously over the centuries and who today are largely culturally and linguistically Arab

https://en.wikipedia.org/wiki/Palestinians

Shut your mouth.