What makes this worse than other things?

I think it’s good to read the article, they explain a lot of it and how Israel is refusing to comply with its ban as a weapon.

Sorry, you were right, it doesn’t explain too much in the article, but this from HRW explains it in much better details: https://www.hrw.org/news/2023/10/12/questions-and-answers-israels-use-white-phosphorus-gaza-and-lebanon

I caused confusion, it was my bad.