Ashton compared deliberate murder of children (in France, Norway, Sderot, and Syria) to what the IDF does in Gaza.
The IDF doesn't deliberately kill children in Gaza.
That's what is offensive, and her remark just adds fuel to the fire for Jew haters who now see hatred of Jews becoming more mainstream. When Ashton says the Jews target children in Gaza, then the Jews must be bad. Therefore, they were justifiable targets in France.
Ashton's part of the problem. She's hardly better than Khulood Badawi and typifies what the new antisemitism is about.