Someone else might say the same about the Hamas attack on October 7th. As the UN Secretary-General said, "This most recent violence does not occur in a vacuum. It stems from a long-standing conflict, a 56-year-long occupation, and the absence of a political solution in sight."[1]

Whichever side you are on (if any), responding to atrocities with further atrocities is not justifiable. It doesn't matter who commits these atrocities

1. https://www.un.org/sg/en/content/sg/speeches/2023-10-09/secr...