They do meaningfully care about the significant radiation that is likely to drift into their own citizens. Israel is not a large country.

Your analysis on nuclear use doesn't consider the lingering poisoning of people and land compared to conventional weapons. It's not Keyfabe. You would vastly prefer being attacked with conventional weapons.

I mean they don't care about pollutants currently harming the health of their own citizens not to mention the environmental crisis and climate change making these regions increasingly inhabitable. Why would they care about radiation? It would be easy to sweep under the rug and wash with undercoverage like the climate issues have been.