Hamas intentionally operating amongst civilians to increase collateral damage is a war crime.
Yes, he likely felt the need to write this. Did you feel the need to write this?
Collateral damage isn't generally considered to be a war crime.
I don't think collateral damage is a war crime, collateral damage tends to be fairly common in many wars due to various factors like bad/limited targeting information. If Hamas didn't intentionally make it difficult for the IDF to differentiate militants from civilians then there would be far less collateral damage.
I mean, that's what it is from the looks of it. Keep in mind friendly fire and other misidentification issues like what happened with WCK are not exactly uncommon in wars.