Thomas Mann wrote that from Los Angeles, which makes it kind of incommensurable with the thoughts of someone in Gaza. Incidentally, yesterday I happened to visit again my city's largest WW2 bunker turned museum of sorts, which includes a sound reevocation of an Allied bombing. Unfortunately the info panels do not include opinion polls of the local population in 1943.
This would a good rebuttal if my point had been 'polling says Gazans support the bombing.' Unfortunately it actually was that thinking they should is not some horrific incitement to genocide
If that's all your point you may as well have picked a quote from a non-German.