Modern (i.e. post nuclear) war is always fought asymmetrically. And great powers constantly fight asymmetric wars. (Israel isn't a great power, but it is an emerging regional hegemon.)
In this case, we have a proxy war between America and Israel, on one hand, and Iran and its proxies, on the other hand, with Gaza and to a lesser degree Yemen being the board's pawns.
> IDF and contractors are just enacting methodical slaughter and starvation techniques in an indiscriminate manner surely?
I genuinely can't figure out why anyone in this war is doing what they are doing.
Hamas' winning move is to return the hostages--they're greater leverage for Netanyahu at this point than the villa-dwellers in Doha. Tel Aviv's winning move is to end hostilities with a tight security cordon around Gaza to prevent Iran from resupplying Hamas. Tehran's winning move is to offer dropping support for Hamas, Hezbollah and the Houthis if the Security Council agrees to (a) an independent Palestinian state and (b) dropping sanctions. (And, like, not bomb Australian Jews. Though Tehran's position makes the most sense, not because it's rational, but because Iranian hardliners gain domestic power when Iran is isolated. Sort of like Netanyahu.) The only folks without a winning line are America, the EU and the people of Palestine and Israel.
That said, detaining a Hamas member is not indiscriminate. Even if the paperwork says they're a librarian, it's reasonable to act on hunches in wartime provided they're treated like POWs.