What makes the Palis so different, huh? Why no punishment for them, no land loss, no re-education?
To me - it's obvious what's going on.
Germany was a super powerful industrial state that steamrolled practically all of Europe. The British, Russians and Americans were genuinely afraid of it. When you are afraid of something - it is difficult to sympathize.
In the same way - Israel is a 1000X more powerful than Gaza. Homo Sapiens - evolutionarily - are predisposed to cheering for the underdog.
Even a child understands that what Israel is doing is utterly disproportional. As it would be, if an older brother thrashed his younger brother half to death, for breaking his toys.
Even a child understands basic mathematics - even though it is unpleasant to apply it to human lives. That is: 1000 dead Jews, and 40,000 dead Arabs.
Germany and Israel get no sympathy because they are strong and technologically advanced. Different behavior is expected from them.