I guess the more accurate, “Israel Returns Fire” does not work for them.
Notice when someone from Gaza is killed, the headlines usually say “ N Palestinians Were Killed” (where N is some number ).
They never use the word — Terrorists, or Hamas Militants, it’s always Palestinians.
Imagine killing hundreds of Nazis in World War II and a newspaper reporting hundreds of GERMANS were killed...
You’ll immediately infer where the sympathies of the news paper lies.