Murdered has a very defined legal definition to it
I dont think Israel falls under the legal definition
murder
n. the killing of a human being by a sane person, with intent, malice aforethought (prior intention to kill the particular victim or anyone who gets in the way) and with no legal excuse or authority.
The brutal execution of over 1,400 Israeli civilians by Hamas does clearly meet the criteria for murder.
Hamas using Palestinian civilians as human shields and not allowing them to leave north Gaza also effectively meets the criteria for being considered a type of deliberate homicide being done by Hamas.
Israel firing back at Hamas terrorists who are trying to kill Israelis and the civilians being used by Hamas as human shields unfortunately being hit... is not murder by Israel. It is very unfortunate and clearly is unwanted collateral damage -- which attempts should be made to minimize. However Hamas is solely responsible for the entire situation.
Due to Hamas the civilians living in Gaza strip are effectively screwed.