They have a right to take out Hamas, they don't have the right to mow down crowds of starving people with sub-machine guns while they're just trying to get to some food
There's no disagreement about contents of the article being a war crime, if it is true.
Haaretz is not a reliable source, they often publish hearsay and seldom verify the testimonies. We have reports of seemingly daily massacres around food distribution sites mostly originating from one single "journalist" with direct self described sympathy towards Hamas and source always being "locals told me", yet somehow it ends up being published in Reuters et all on a semi-daily basis.