what would you consider to be a proportionate response to the massacre of 1400 civilians?
Even by IDF figures these were not all civilians; IDF say 20% were active service military.
I would say arresting and bringing to justice those responsible.
I believe, but am not certain, that all those potentially directly responsible for the deaths have been killed. That seems more than proportionate; there is evidence for extra-judicial execution of those involved.
I do not believe that killing Palestinian civilians at a ratio of 50 children to every alleged Hamas commander is proportionate. How many children do you believe would be proportionate?