@ScrollingLeaves
"What you say is very logical but to me unbearable.
It makes me think that on that basis there is the inevitability that there will be the next atomic bomb, where the same perfectly logical principles ( or possibly the same apparent excuse) will apply again."
I totally agree it's a horrible concept to examine - the heart says in a perfect world no lives should be lost at all, whereas the head says it's not a perfect world so it's better to lose ten lives than lose a hundred.
On your point of the inevitability of another atomic bomb I think that brings us back to the concept of disproportionate retaliation. For example I genuinely think that if Putin knew he could drop one small nuclear bomb on Kiev and only receive one proportionate small nuclear bomb in retaliation then I think he would definitely take that option.
However what is stopping him is the strong possibility that the retaliation would be disproportionate and be 100 nuclear bombs. So in this example the belief in a disproportionate response actually helps avoid such an attack.
The problem in Gaza is that Hamas actually want a disproportionate retaliation and are quite willing to accept a high civilian death toll because they can then play the victim .
Unfortunately there are many in the west including the western media who's metric of good guys or bad guys is based on which side is the stronger- with the stronger side always being the bad side regardless of the cause of the conflict.
Of course the who loses out most here is always the innocent civilians.