Umm..Quick Question. Why is Hammas fighting the Palestinian Security Forces?

The Palestinian Security Forces are the police of what will eventually become the new Palestinian State. Why is Hammas fighting them in the streets? Was not a primary goal of Pelestinian Terror Groups the creation of an autonomous Palestine? Seems to me that Palestinian Terror has little to do with Palestine. Or, do they consider the Palestinian Secruity Forces to be the lapdogs of their Zionist masters?

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