You do not get the root cause! BT :
Hamas is part ,or an offshoot of the Muslim Brotherhood, which is a transnational Sunni Islamist movement that seeks to implement sharia (Islamic law) under a global caliphate.
While these branches operate under a variety of names and use a variety of social, political, and occasionally violent methods, they share a commitment to the overarching goal of establishing rule according to sharia. The most notable and lethal Brotherhood offshoot is Hamas, the Palestinian terror group operating out of the Gaza Strip.
So Hamas gets help from the Muslim Brotherhood ,Iran ,Hezbullah etc
The Brotherhood operated an underground violent group—the “secret apparatus”—dedicated to the eradication of British rule in Egypt and of the Jewish presence in Palestine.

“Islam does not recognize geographical boundaries, nor does it acknowledge racial and blood differences, considering all Muslims as one Umma (global community of Muslims). The Muslim Brethren (Muslim Brotherhood)…. believe that the caliphate is a symbol of Islamic Union and an indication of the bonds between the nations of Islam. They see the caliphate and its re-establishment as a top priority.
They are not interested in Palestine, but in one Umma (global community of Muslims). Stretching from Marroco to Pakistan

But please send in your donations to the poor Palestinians!!