First of all, the proportional response should be delivered directly to the source: Iran. There are lots of bad guys in Gaza, but there are lots of innocent people too. Indiscriminately killing everyone is not the solution.
Come on armchair commander show us your battle plans for Iran. Do we nuke it? Do we destroy all the dams? Do we hit just the nuclear facilities? Or do we eliminate their oil industry? Maybe just all the military bases, oh we forgot all the subterrains rocket facilities, do you want to invade Iraq style?
If the IDF would have Indiscriminately killing people then the number would have been 10x, and you know it.
B) When soldiers flood across your border from a neighboring polity by the thousands, it would be an abdication of sovereignty not to defend against that immediate threat, regardless of the enemy's funding sources.
Very hard to believe.
https://www.newsweek.com/israel-has-created-new-standard-urb...
https://www.linkedin.com/posts/johnwspencer2018_israel-has-d...
Note the falsification of Hamas casualty figures:
https://www.yahoo.com/news/hamas-quietly-drops-thousands-dea...
https://www.washingtoninstitute.org/policy-analysis/how-hama...